Domestic supply has excellent testosterone in dbol. You're never gonna go wrong. Use Beligas or PharmaQo. Do the dbol 20 to 30 mg a day and testosterone up to 500 mg a week. Make sure you also order Aromasin.
When it comes to sarms, you don't need to over complicate things. I think the safest options for someone your age are nutrobal and GW. Those stack well together and they are not hormonal like anabolic steroids would be.
Definitely you need to use a support supplement and you also have to keep your cycle smart otherwise you'll end up hurting yourself. That's why I recommend going with n2guard as well.