My first newb Q's

[Novice489]

I would say you need to do a lot more reading before considering a cycle most of the questions your asking are in the stickies on this forum.

Which I am imagining will be an extra 15-20 lbs muscle gain

You'll likely gain 20 lbs, shed about 8 to 10 lbs of water, and you're left with 5 to 6 lbs of muscle and some fat. -Austinite