Lots of horns blowing or sharp turns may indicate that you want to hunt another driver. Try recruiting among college students. They have time, cars, and a great need for pocket change. Pay for drivers varies by location. Including the cost of gas in the per hour charge simplifies the bookkeeping end of the process.
Tips are appropriate for good or extra service.
A few dollars is a small price to pay for keeping a good driver happy. If feasible, you may want to ask local law enforcement personnel about the driving record of the people that you want to hire. At the least, obtain the social security number, driver's license number, and full name and address of any one who drives you. You might also want to write down the name of the driver's insurance company. Liability is usually not a topic mentioned by prospective drivers.