I don't think you will miss any significant gains. I have read some studies that say your body is more "primed" for growth during the first 8 weeks of a cycle (I don't think I have the article any more, my old computer bit the dust a couple months ago, but I'll try to find it again). This is why lots of people choose to use a short estered test, frontload a long estered test, or run a long estered test with a frontload of a short estered test. Since it's your first cycle 10 weeks is fine and you can save the gear for another cycle further down the road.
hCG should not be used for post cycle therapy (pct). It can be used during a cycle to prevent testicular atrophy (shrinking of the testes). Human Chorionic Gonadotropin (HCG) is suppressive of natural testosterone, because it takes the place of Leutenizing hormone (LH). LH is not the first step in the chain, instead its manufactured in the pituitary under the response of gonadotropin releasing hormone (GnRH) secreted from the hypothalamus. Since a LH mimicking agent is supplied exogenously the negative feedback signal to the hypothalamus will tell it to stop making GnRH, so no natural LH is produced. Thats why we use a potent estrogen receptor antagonist like nolvadex. When Androgen levels drop these antagonists lower estrogenic response creating a steroid defecit that signals the hypothalamus to start making GnRH. If you decide to use Human Chorionic Gonadotropin (HCG) it should be discontinued 2 weeks before Nolva or clomid or it will suppress natural test.
I have used Human Chorionic Gonadotropin (HCG) during every cycle but my first and I wont run a cycle without it, but that is my personal preference. Evidence and experience shows that the testes will grow back to normal size following proper post cycle therapy (pct) anyways. Anecdotal evidence also shows that it can give an increase in libido during a cycle especially when compounds such as tren and deca (that can decrease libido) are run. But as long as Test is the base of the cycle, libido shouldn't be an issue.
If you decide to run Human Chorionic Gonadotropin (HCG), the usual dosage is 500iu/ week (250iu twice per week). You can just pin it the same day as your test to make it easy.