Focus on using your jeep and having fun with it. Join local groups that do trips and learn the capabilities of your rig and learn how to use it/drive offroad. No offense, but you've been posting a ton of new threads, all basically asking the same thing and getting the same responses. Learn your truck first, build it how you want/to the class you want to potentially race, and then decide if you actually want to race, or if you can even afford to race. Each race will run you $1000+/- in entry fees, fuel, parts, prep...
To answer your question, here is how you should spend your money in order:
1. Gas for the jeep and parts to make it run well.
2. welder.
3. as much scrap metal as you can find at your local metal supplier. Common sizes for things are .120" wall tubing in 1.75" diameter (measured from the outside, make sure you are getting tube and not pipe). For sheet metal you'll want 1/8", 3/16", and maybe 1/4".
4. two 4.5" angle grinders from harbor freight. One you will have a cutoff wheel on, the other will have a flap disk. Get a good supply of both disks to keep on hand. Amazon is your friend for this.
5. Milwaukee Markzall. Skip sharpies and go straight to these.
6. PPE: Harbor freight gloves, safety glasses, and whatever flavor earbuds you like.
7. Build a rear bumper and learn how to use your tools. Start here so you can understand how much effort goes into making something simple. In a couple years you're going to hate it because your skills will progress, and it's easy enough to cut off and rebuild at that point.
8. Don't make any more threads about racing until you've made your rear bumper. Then come back and ask what to do next.