Dude... Seriously, did you read the answers for the question you asked?
They all said the same: "no, don't even think about steroids". And your next question is "if I choose to take it anyways..."
Seriously, you need to rethink everything. People don't just say crap so they are the only ones built in the world, they tell you not to take because it's bad and will fuc# you up. Your friends taking it, how old are they? Cause one that will tell you a lot, specially if they are older. If not, then yeah, they are gaining a lot right now, but in 3 years they probably won't be able to make any gains at all because they won't produce any testosterone anymore, not to mention have to live with a bad liver, and a fked up system.
So my 2c are: Stop trying to go on steroids. Stop asking about it or hoping that someone will come and say "hey, it's ok to take steroids, you clearly love football and need it, just do this, this and that". That is not going to happen. So listen to them.
What you need is:
Protein Shakes
Kwik Carbs
Creatine
Multivitamin (Personal fav is Orange Triad)
Fish Oils (10 caps a day)
Sesamin Oil (6 caps a day)
If you want some more research some Na-RALA and Chromium Picolinate
That should be all you're taking, aside from large amounts of beef, chicken, brown rice, whole wheat pasta, peanut butter, and things alike. You need nothing more than that. Exercise, exercise hard, exercise a little more, have a good 6 meals a day, around 4000, 5000 calories, sleep 9, 10 hours a day, and take your staples and you'll be fine.
You're a freshman, you have another 4 years ahead of you, if you follow these plans by the time you're a senior you're going to be a beast, and outplay anyone who's taking steroids when they are 14.