I recently purchased my first Fixie and wanted to build it up to have a few different setups. I wanted two wheel sets and one with set with an internal gear shifter in the hub with a more aggressive tire, and than a second set that is classic fixie.

Question one, for my special set should I do a hub swap or do it myself? Also can I put any sprocket on any rear wheel? Very new to this kind of project, any help is appreciated..

Go to SheldonBrown.com and read the tech articles about internally geared hubs. There's a wealth of information there, and you're better off spending some time to research the topic yourself, rather than have answers fed to you here.

What you're after can be done, but you'll have to pay attention to rear hub spacing--not every hub will fit your frame. Some might work with modification, but others are too wide for your frame. Read up on how to measure over-locknut-dimension (OLD) and then you'll know what size of rear hub you can fit. The front is easy; most hubs are 100mm, whether meant for a fixie or a road bike.

You can get rear cogs (fixed or freewheel) from 12 to at least 20 teeth that will fit on any standard track/fixed gear style of hub. If you're new to this kind of thing, don't try rebuilding the rear wheel to get the hub you want. Buy a complete wheel or have it built for you. Some good sources include Retrogression and Velomine. (Google is your friend.) You can get a complete rear wheel of decent quality starting around $100, or a really good one for $200 or so.

What's a fixie?

A fixie is where the rear cog or gear is fixed to the rear hub and does not freewheel. When the wheel is turning, the cog is turning, the chain is turning and therefore the crankset is turning. No coasting.

Oh, you mean a fixed gear?

No, I think fixie is short for fixie-upper, because you need to upgrade to a freewheel so you can coast?

A fixie is what happens when a freewheel is broken.

these are what Chip & Joanna ride around Waco between filming, right

There's an upscale bike shop about a block from Magnolia, true story.

(My grandmother lives in Waco)

First you go to dopeassfixiegearparts.com then just buy a Bigshot and you can put your colors on their to make it customz

My original wheel set had fixed and freewheel but I bought a lighter better quality set of wheels that is only freewheel. As it stands right now I do not know if I would be better off replacing the rear hub with a geared rear hub making it no longer a single speed, or if I should purchase different cranks so I can adjust the gratin based on the ride I plan on doing. Any advice of what to look at?

Put the old wheels back on or ride it single speed.

I'm confused on what your goal is here. Do you want to be able to change gearing while riding, or only with tools while stationary?