after building the enclosure, i want to paint the box, instead of using carpet. What kind of paint would i have to use. After im done painting it i want to add a shine to the box. I want it to be a shiney black color. What are the things i will need in order for me to achieve this goal?

If you're using MDF, it's a pain. Trust me.

First, it needs to be ABSOLUTELY flawless. The slightest mark in the wood ANYWHERE is going to show up in gloss paint. Expect to have a ton of coats on it. I had my buddy paint a HT enclosure for me with automotive grade paint and primer. It took 8 coats of primer before it was ready for paint. Is this the look you're going for?:

If you're using MDF, it's a pain. Trust me.

First, it needs to be ABSOLUTELY flawless. The slightest mark in the wood ANYWHERE is going to show up in gloss paint. Expect to have a ton of coats on it. I had my buddy paint a HT enclosure for me with automotive grade paint and primer. It took 8 coats of primer before it was ready for paint. Is this the look you're going for?:

Thats exactly how i want it. I emailed Fi Car audio and they gave me the dimensions. Should i use that? its tuned to 33hz. But i mean when i go to home depote what should i buy for painting the box?

I had that done in a paint booth with automotive grade paint. It turned out great, but at a cost. Rattle can is your only option really, as roll on paint won't give you what you want. Rattle can is still going to be really tough. You get what you pay for.