If you run MK-2866 solo, you want to run it for 12 weeks at 25mg per day. The only source I would get it from and recommend is
www.sarmsx.com
Your pct afterwards should look like this
PCT
https://www.sarmsx.com/stacks/sarms-mini-pct-stack-1
Clomid 50/25/25/25
GW 20mg per day
What exactly is your full stats, experience, and goals? This cycle could be enhanced quite a bit by stacking other sarms with it, but how it's set up depends on what your goals are. Let me know that and I'll get a sarms stack all setup for you