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Lots of details of the finishing process in this book: https://www.amazon.com/Guitar-Finishing-Step-Step-Erlewine/dp/0977651908/ref=mp_s_a_1_3?dchild=1&keywords=guitar+finishing+step+by+step&qid=1610714978&sprefix=guitar+finishing+step&sr=8-3
This is a great book on the subject which goes through a lot of different options. I've seen the first edition at my local library. https://www.amazon.com/Guitar-Finishing-Step-Step-Erlewine/dp/0977651908/ref=sr_1_3?dchild=1&keywords=guitar+finishing+book&qid=1635712362&sr=8-3
This book taught me a lot: https://www.amazon.com/Guitar-Finishing-Step-Step-Erlewine/dp/0977651908
You don’t need a fancy air pressure spray system though. You can get great results with spray rattle cans, stains, or finishing oil.
Buy this book Read it. Read it again. Then ask questions.