PCT for my first cycle

OK, i know all of you are probably sick of noobs like me asking what i should do for PCT...but i want to make sure i get this right.
Starting next week i'm going on my first cycle:

week 1-4 = 40 mg dbol
week 1-10 = 500mg test (this is in an ether i think - 1 shot per week or maybe 2 250mg per week)

Should i have nolva onhand now incase of gyno?

When should i start clomid...2 or 3 weeks after last shot? and for how long?

also can someone please explain the impotance of clen and letro?
What do i need to be fully prepared

Thanks a lot everyone

Yes have nolva start clomid week 12 i would follow pheednos pct its a sticky