Most states have pro bono programs started by the USPTO to assist inventors in filing patents pro se; ie, by themselves. Contact the USPTO to find out how to contact the relevant people in your state.
You can file a patent application on behalf of yourself or your co-inventors.
I would suggest you file a Provisional Patent Application (PPA) on your own for about $60 with the US Patent Office. Once you have filed the PPA (which is never examined and isn't a real patent), you have 1 year to claim ``patent pending'' before you must file your utility patent (maybe $5000 or more).