I gained 27 lbs. On a test cycle
Yes, you will get respectable gains. Your diet will be the key. If you don't eat you won't grow. Occasionally I see posts where guys say they aren't gaining at week 6,7,8, 10 etc. they claim their diet is in check. When they post up their diet it's either crap, not enough calories, nutritional macros are jacked up or they have not adjusted for the new weight and have stopped growing.
My suggestion is to research your diet, plan your diet and take it as seriously as planning your cycle. Most guys also gain a lot of fat on their first cycle, this in part is due to the lack of planning in regards to the diet. Bad calories = bad weight.
Another point I would like to make: IMO, you should eat more than 500 calories over your mantance level. I see a lot of guys that say "I'm not getting bigger and I'm eatting 500 calories over maintance". IMO, you should not plan with a fixed number. If you are 5' 9" 180, okay maybe 500 over Maintencne will get you there. If you are 6' 2", 220, your pissing in the wind at 500 over Mainatnce.
Research and plan. Spend sometime in the diet section here on Ology, everything you need to know is there.