Including a family group sheet is ideal. Also, clearly state a financial limit for research. Most people like buying two lookups at a time. Another plus would be to let us know what resources you have already checked so that we do not repeat any of your research. Copies and postage charges are extra in all cases, but these are most often minimal.
All payments are by check or money order.
The payment address will be provided when your e-mail request is received. NO genealogy researcher can absolutely guarantee that your ancestors will be in any given record. And remember, it takes just as much time and effort to determine that an ancestor IS or IS NOT on any record. GenChooz does a lot more than check a book or CD, which is what most lookups you'll find on-line are anyway. What's worse, there are many records on CD's that are far from complete, but give the impression that they are all of that type of record that is available.