remember that steroids like test prop allows your muscles to "attach" more aminos to them... so basically, if you do steroids and dont eat carbs and protein, steroids have nothing to work with... steroids are like a construction workers - best in the world, but the protein and carbs are quality materials, and without the materials the workers cant build anything. it is more important than it sounds like.
i wouldnt suggest anything at 10-12 weeks... i have done long cycles - didnt go too well... im a believer that you can do hit and runs - 4-5 weeks... you get in and get out fast - youll get less sides, less time off, less chance to screw up. there is actually an artice about this with blood work and everything where the dude researched this stuff...
you do have to let your natural test to restore after the cycle, so - time on = time off, or - i do 5 weeks on, 7 weeks off(it makes 3 full months so its easier to plan). Because whats the point of a hot body if you wont be able to fcuk some babes with it, right? Take at least equal time off to know that you will be able to continue enjoy the benefits of your body for a long time.
id say - go 4 weeks by doin test prop 100mg every other day - 1day, 3day, 5day, 7day, 2day, 4day, 6day etc etc... so, 4 weeks = 28 injections of 100mg each.
if you will gain good, take 4 weeks off and do the same again. dont up the dosages while it works - you dont want to end up like me by taking 1g of test just to get it to work - its just expensive
you will not need a cut cycle for a while - you are in a good shape and that will not change as long as youll eat right. youll get bigger but remain the same condition for a while...
we will be able to talk about some cutting only when we will see how you look after a few cycles with some new mass cause its possible that the only thing youll need to cut is to add some cardio...