What kind of Sub box should i get?

A sealed enclosure will have good sound quality but not be as loud or reach as deep as a ported box. A ported box can sound just as good as sealed and have the deeper bass extension if built correctly, but it will take up twice or more the volume as sealed. For 2 12 subs you're probably looking at 4cu. Ft. internal volume. You may only need 2 cu ft for a sealed enclosure. Its up to you what you have room for. A ported box generally will have a spike around the tuning frequency and slightly higher where it is loudest. It will drop off severely below tuning and drop off less severe above. A sealed box will keep an even response and slowly drop of frequency in the low end. But it won't be near as loud.