i agree with the others...work your way up...i know at age 16 my detailing business started with a bucket (it used to contain kosher pickles my family used at our restaurant), some laundry detergent, a can of turle wax, and some old bath towels....if you want to jump into "full" detailing...i.e. paint correction, interior, exterior, engine bays, etc...i recommend you practice on friends and family first. Basically people who are willing to give you their cars for an entire day (10 hrs +). learn what products work for you...and look for products that will help you save time for the methods you use....for me a bucket wash is a time waster...somer prefer it...so i invest in foam guns and foam lances...not bucket dollies and grit guards (even though i still have them

)...everyones technique yields the need for different tools...i dont use interior brushes..i use compressed air cans instead....you can see the list of tools is endless...and thats why you should detail a couple cars first to see what needs you have...as you detail more cars you will see gaps in your technique and supplies...and then buy and learn accordingly