Advice for first Cycle on Mk 677 ?

Hi, I just bought some Mk 677 and I wanted to start a Cycle on Mk 677 for around 2-4 months. I have only trained natural so far and wanted to ask you guys for some advice on Mk 677, such as what do be careful with, and especially your experiences and what I can expect from it.

Current data: 21 years old 6.3 85 kg

Thanks !