First cycle advise…

Ok so I’m 29 years old, 170lbs, and 6’1. I have a pretty lean athletic build with minimal body fat (i can see my abs). I’ve plateaued pretty hard in the gym recently, i work out 5 days a week. I eat a decent amount, i used to count my calories but that was too time consuming but i meal prep healthy breakfasts and lunches and eat a solid dinner most days. So my appetite is there but i know if assisted with something to increase my appetite i could increase mass.

What I’m needing help with is the following:

1. Where do i get blood work done and how frequently should i get it done?
2. What should i be looking at / monitoring on the blood work sheet or ensuring is being tested?
3. Where can you buy reputable supplements?
4. What stack and post cycle therapy stack would you recommend and for how long?

Ok so pretend I’m 10 years old and don’t know a damn thing about anything when explaining this to me.

If you can use some sort of backed proof or study rather than “it’s what my buddies third cousins sisters best friends uncle did” would be appreciated and more than likely what I’ll try out.