Every single one of your questions can be answered with a day of reading the stickies on this very site with the exception of your primary one, which would require a bit of the search function. Even though you seem to be coming off as you're going to do AAS regardless of what we say, I hope you take what is said to heart. So with that said, let me break this down for you to the best of my ability:
1) You're 18 and still have TONS of nature's AAS flowing (Anabolic/Androgenic Steroids) in your blood stream. This is really a great time to capitalize on such a fact and use this to your advantage. You will be able to put on muscle mass faster than at any other time in your life as well as see less recovery times needed. This is provided you are eating properly, which I will cover later.
2) At your age, your endocrine system is still developing. This means you are still growing in height (not necessarily measurable) and starting to obtain greater bone density. Your brain is still developing in its ability to perform critical thought processes and finalize your ability to make quick decisions based on your ability to discern right from wrong. This may seem somewhat trivial, but excessive risk taking due to this ability being impaired can easily put one in the grave at an early age. It's no coincidence that young guys jumping on AAS are more cocky and take greater risks to their well-being. As these systems are being finalized well into your early 20's, any disruption by adding in additional hormones can upset their delicate balance forever - changing who YOU are forever.
3) You're 6' and 150lbs. You state that you have proper training and nutrition, but let's face it: You could be doing MUCH better as you have a great deal of potential left naturally. I would wager that you could easily put on another 30-50lbs of muscle mass with a proper diet and training regimen over the course of the next few years. Applying AAS to this would expedite this growth, but at the cost of tendon/ligament growth as these are NOT built up by AAS. This will very likely result in injuries later down the road which will set you back considerably and will impact your quality of life for the rest of your days. I know this from experience as I have two horribly blown knees and a rotator cuff injury that keeps me from enjoying some facets of life.
4) You need to ask yourself WHY you want to look into AAS. Do you plan on seriously competing in bodybuilding in the future? Do you just want to look "swole" for the ladies? Do you have a certain body in mind that you will not be happy with until you achieve it? (The last one can be viewed as dysmorphia, a disorder similar to anorexia btw) Once you know the answer to this question, you then have to ask yourself the question if the risks are worth this outcome. Do you know what testosterone replacement therapy (TRT) (testosterone replacement therapy) is? This is a potential outcome regardless of how careful you are in that you could potentially shut down your testicles FOREVER, requiring you to inject testosterone for the rest of your life as your body has permanently given up on making this crucial hormone. Along with this comes the inability (or reduced ability) to have children. Are you ready to give up on this ability at 18? Think carefully about your answers and be truthful with yourself as this isn't something you can undo once you've started down this path.
Now to the questions that you can find in the stickies, so I'll just give you the short-versions as this information is readily available in them in far greater depth.
1) Injections are not worse than orals. They both carry inherent risks and orals include liver toxicity while injections do not.
2) I'll leave this to further study once you've gone through the first portion of my post and given it thought.
3) See #2.
4) You cannot avoid all side effects. Male pattern baldness for instance is something you will either experience or won't. Some side effects can be relatively negated with the use of other drugs, but even those drugs carry potential side effects.
5) You will always lose *some* of your gains, mostly in the form of water - but a proper post cycle therapy (pct) (post cycle therapy) can reduce this atrophy by returning your body to it's natural state faster. Most gains are lost by guys that do not follow a proper post cycle therapy (pct) and remain in a low testosterone state for an extended period. Without testosterone to facilitate the synthesis of protein into muscle mass, your body will deem that the muscle gained is no longer beneficial and will consume it for energy. This is also where diet is very important as muscle is fuel, and if you do not consume enough calories with the proper macronutrients, you risk this catabolization of muscle mass.
6) I'll leave this to the sticky about SERMS/AI's. (Selective-Estrogen Receptor Modulator/Aromatase Inhibitor)
I hope this answers your questions and even gives you food for thought. Remember, AAS is not a decision to be taken lightly, especially at your age when you are still developing and have your life ahead of you. Making a poor decision now can haunt you for the rest of your life, remember that.
My .02c
....basically what im trying to say/ask is, after going on 1-2 cycles and doing a proper post cycle therapy (pct) will our bodies get back to its natural state (hormone wise)? Also you said about bone development, would me going on AAS stop my bone development completely? and finally if i did blood test every 2-3 weeks this would allow me to notice any harmful changes occurring.... so i dont think one cycle would hurt me to badly??
