The 501c3 is it's own entity for income tax purposes ... so the money you "paid on behalf" of the org are donations to the org ... the org reports the donations as income and the expenses paid with those donations as expenses on THEIR tax return.
YOU get to deduct the donations on YOUR tax return IF you do/can ITEMIZE deductions.
I HIGHLY recommend you see local professional guidance/education this first year to get your books set up properly and file the returns that are needed timely ... failure to do so can be costly.
