Okay, couple of pointers here: you should put a sealer on before a wax. Sealers generally do not like adhering to waxes so the first time you get it wet, the sealer is gone.

Paint renovator is basically an abrasive compound which eventually will wear through paintwork. AG Paint Renovator is next to useless.

If it were me, I would do the following:
Wash the car using a wash-mitt and the 2-bucket method.
full clay over the whole car.
Wash the car again (just water is fine).
Assess what "damage" is on the paint, scratches, swirls, etc. If bad, you may need to get someone to machine polish the car with some appropriate compounds. This is not actually that expensive. Again, look on www.detailingworld.com for more information.
If the scratches, etc. are not that bad, go for something like AutoGlym Super Resin Polish. This is a filler polish and, if applied correctly and using a couple of coats, will fill in any swirl scratches to an acceptable level.
Then, go over the whole car with a suitable sealer. Something like LimeShine, or AutoGlym Extra Gloss Protection is fine. Follow the instructions and leave for @ least 30 minutes before removing. Then start on the waxes. Find something you like. I would probably say something like Meguiars Stage 3 Caranuba Wax, Poorboys World Nattys Paste Wax or similar. Apply a couple of coats 24 hours apart and you should be fine.
Use a decent trim dressing on all plastic unpainted parts, something like AutoGlym Vinyl and Rubber Care or AutoGlym Bumper Care are good ones. Stay away from silicone-filled tyre shines. It does not last, it does fly off over the paint and it does attract dirt.

I have suggested mainly AutoGlym stuff in this instance as obviously you are trying to do this cheap, and these products can be found in most places.

To give you an example of how it can look @ the end:
1992 Sierra with original paint







22 year old Cabriolet (sprayed in 2003)







19 year old 2000e