Just to clarify how the estimate emails work...
You create a job and tick the Estimate checkbox, then add it to the Planner. At this point, the Estimate will be marked 'To Do'. Mark the estimate Done and adjust the price when you know what you want to charge, e.g. this might be after you have visited the customer. At this point, you should see the Send Estimate button at the bottom of the Edit Job popup.
Mike: I may be able to help you with your logo... do you use anything at the moment, e.g. on your van, or have any idea how you would like it to look?