I am a pastor (or minister or clergy) in a church! I became one back in April 2016! I've had quiet some expenses for the remaining 8 months!

I did receive $60 for gas expenses one time! but because of the financial strain of our church i do not wish to receive any income! But the expenses that i have made in the past 9 months like travel expenses are quite big! for example the mileage i drive from my house to the church is 125.4 miles , but in one week i drive a total of 250.8 miles! I was told to put it a charitable donations! I had read to file as self-employed so i was going with that, because there were other expenses that i made using my finances! I also don't know if i apply as minister, clergy or pastor . I have documents to back up as minister or clergy i guess until my inauguration as pastor!  Please help, I am new at this!