well for shear rock bottom go racing mods. do only what your org requires for stay etc.
You will quickly learn what needs to be done. then do them as you budget allows.
As you make changes to your bike you will need to adjust your riding to suit.
If you get serious you will need to do a lot, but start with the simple (cheap ) stuff.
Report your progress here and we will help
I hate PMs if you want to contact me, find my email address.Look in the for sale section.