You could have done that yourself. Do the work in house. If you have the skills use them. This is probably the best option with the only exception being a known one off requirement that you are sure will not arise again in the near future. If you have got this far then perhaps you would like to complete and submit the above form.
Flow diagrams can be a useful method or capturing requirements.
Again if you would like a flow charts please request one. Note, all work will be telework. Example of a project breakdown for an MS Access project. Example of a flow diagram for a Web application.