Hey guys, i got a few questions to ask and dont tell me to search because i have and it just doesnt make much sense :/?

I own an AE71 and id just like to know:

First of all, whats the difference between bigport and smallport?

Should i get a 20v or 16v?

How much would be a good price to pay for everything?

Parts that i need with an AE71

Thanks heaps in advance<3