3 at the most. starting out, I think just 2 is right. if you end getting higher end people, or you can convince a lot of paint corrections, then add that as a 3rd. for me, 90% of my clients want a "full detail". for me, that's full interior (shampoo seats/carpet, everything plastic gets cleaned and most if not all gets shined with a water based dressing, spot clean the headliner, and glass last). exterior is quickly clean and dress the engine, wash, dress tires/wells, and use Megs AIO M66 on the paint (no clay/iron-x unless it really needs it). if the wheels need a bit of polishing do that as well, otherwise don't polish the wheels, just wash them. prices we charge in a low-budget area is $120 for cars up to $160 for 3rd row SUV's. a bit more if its extra bad, a bit less if its unusually clean <---customers either get rewarded for making my job easier, or the opposite for making my job more difficult, and they really appreciate this. you cant throw every car into the same pool. some people don't know what a car wash is, and others pay for the unlimited membership at the local car wash and drive through 3 times a week.
now I realize these prices are stupid low for a lot of people on here. but its all about location and overhead. I work at home in the driveway and garage. so I have no overhead at all. pay a helper $12/hour which is way higher than any other shop or body shop offers in this area, so he is super excited to go to work each day. together we average about 12 cars a week. pretty good money for being your own boss and working at home doing what you enjoy.
occasionally I have a customer who I just cant convince to get a full detail so we just go piece by piece to decide what they want and what to charge, ala carte style. same thing with paint corrections. most people don't even understand what that means, so you have to explain it in detail while using some sales tactics to try to convince them to get it done, since this is usually the biggest money maker. where I live paint corrections are very few and far between. most people here want clean and shiny with the stains removed from the seats, but that may not be your market down there.
far as a flyer, I had some made from a guy on the Bay who did them for CHEAP and did a ridiculously good job. we sent 65 emails back and forth over a week until I had them just the way I wanted them. I used 5x7 inch postcards printed on both sides. all of the info and services listed on the front, then before and after pictures on the back. really thick card stock, and super glossy on both sides. customers have been really impressed with them. don't put prices on them because people will think everything will fall into that price category (learned this the hard way last time). just Google "auto detailing flyers" to get some ideas. hope this helps