Sell your beats online or in person but always have an "agreement" ready for your customers. They do not need to sign this agreement, you are simply giving them their rights of information. This contract should help you starting out, you will need to add certain legalities based on your State in which you reside and are doing business in. Such additions can be found online or discussed with a local attorney.
This is a template for you to edit to customize for your business, standard rich text document should open fine in word and other similar programs.