Welcome Sarah! Great questions, and honestly the overwhelm is totally normal when you first get into this space.
For your goals (skin health + anti-aging) I’d say GHK-Cu is probably the most approachable starting point. It’s one of the most well-studied copper peptides, the research profile is solid, and it’s generally considered beginner-friendly compared to something like a GHRH/GHRP stack.
My general advice: start with ONE compound, give it 8-12 weeks at a consistent protocol, and document your baseline before you start (photos, notes on energy/skin texture, etc.). That way you actually know what’s working.
Also, make sure you read through the research on whatever you choose before starting. This forum is a great resource but do your own due diligence too!