Sponsorship letters - all input welcome

I'm new here, but I've recently been working on putting some things together in hopes of looking for a sponsor in my Equestrian endeavors. I don't have the cover (personal) letter written yet, mainly because I'm not sure where to start. However, I do have my resume finished, and was hoping to get some feedback on it.

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(the URL is - please excuse the file size)

Thanks in advance!