Tweetwell your starting off good...read and read more...when you think your there...wait for it! Keep reading/studying!
Ok that being said, your at a great age where your natural mass has peaked and your hormones will begin a "slight" natural decline soon so starting AAS cycling now can be done very safely.
1) remember less is more...especially when new...compounds even in low amounts will give great gains.
2) compounds to use depend on your goals...it is summer time so I would suggest if your shirt is going to be off to use low androgenic high anabolic gear
3) as you progress with AAS cycles gently raise what you do because once you go high its hard to go back because the body is very smart
4) always use test as a base (or even solo)...remember this "test is best"
5) a good summer simple cycle would be 250-500mg of test c (my preference is test E) with an oral like winstol or anavar. I prefer long chain esters but I'm sure some here will point you into the direction of test prop which is fast acting and requires everyday or every other day injections.
That's a good start, hit me up if you have more questions...