Agree with what CraigoScott's said.

The Menzerna range are superb and if you've only light surface defects to remove then you could get away with a single pass with the 106FA final finish, which is capable of removing light swirls etc. and refines down to a perfect finish ready for the protection stage (your chosen sealant or wax, or both).

If the swirls are more severe and you have a lot of random scratches etc. then you'd probably need their PO85 RD Intensive Polish to correct and then finish/refine with the PO85 Final Finish (this has an even lighter cut than the 106 finish polish I mentioned earlier and is Menzerna's finest grade polish for refining). You could just use the 106 to refine after the Intensive polish if you wanted as it would still do a great job, it's just that I prefer to use the finer one.

Most detailing traders do a 250ml Menzerna sampler pack with all 3 products I've mentioned plus a more aggressive cutting polish 'power gloss' as well. Each 250ml bottle is more than enough to correct several cars so is great value.

Best of luck with it