ok well isnt there a plugin on an amp that can go straight to sound board or what do i need to put it in before it enters soundboard? i am kinda confused.

As far as the pa goes i am going to buy 2 1000 watt peavey speakers and i am going to buy a sound board and a power amp that has probably 750 pers side or 1000. so how exactly do i set that up? o and later i am gonna buy some yamaha monitors and a power amp for that. I just need to know how to set that up so i dont blow anything. thanks