Need HELP!! First box build 2 sundown ev 12
 

So i been doing alot of reading i think its about time i start my own build, Just dont know wat kind of box will give me the most bang. i wanna go big and nice with this build.

So first ?
4th order or just Vented

Second ?

What program does everybody use.

Third ?

Anybody got any god box plans maybe already layed out for 4th order or vented for Two sundown ev 12
I read somewhere u can use sa box plans same spec dont know if i beleive that or not

O yeah THIS is my first post every every piece of advice is gladly appreciated