1.) Get a spool. The diffs don't use nylock nuts on the other side of the outdrive, so a spool is the rear is your best bet. You may be able to fit a nylock nut over the plastic piece to keep the front from loosening up.
2.) Adjustable turnbuckles, for adjusting camber. Not sure if the TC4 comes stock with it. Alu. shaft for durability, and ball bearings for smooth turning parts.
2.) Buy threaded shocks. AE shocks are super small and without spacers they won't work. With threaded shocks you won't lose any spacers and you can fine tune your TC4.
3.) Soft/Medium in the back and Medium/Hard springs in the front. This is best for drifting control. The good thing about AE is that they don't just make Soft, Medium, Hard, etc. They do it by the pound. I usually start from Medium all around, and they way it's setup for me I like it. Stay with around 20wt oil as a start.
4.) Toe in. You want the toe in to be about +2 or +3. Keep the front 0 or +1. You can't adjust this with turnbuckles for the rear, so you will need the special arm mounts that have the numbers on them for the rear. I use +2.5 and works great.
For tires, it really depends on where you're drifting and your budget. If you have the tools, ABS tires all the way. Yokomo makes drift rings made of ABS for their drift tires, so I highly recommend them. The thing about Yokomo is you have to set the camber to where both the rubber part and the ring part both hit the ground. With HPI T-Drifts or ABS, they are good to go with 0 camber.
Setting up is easy to do, you just need the proper tools. Make sure you buy SAE tools, since the TC4 comes stock with SAE not metric. Make sure you buy a turnbuckle tool.
You won't need the FT version. The plastic tub is best for wear n tear and running around. The first time I brought my carbon fiber chassis out, I nearly cried because of the scratches

. CF is best for racing. If you do plan to get the carbon fiber chassis, buy the chassis protectant sheet.
Also, if you're a serious drifter, get a setup board. These will give you the most accurate settings for your car. Or you can just buy an RPM camber gauge. Can't help you with the toe in though, I still need help with that

.