Tax break for no income pastor

I am just curious if there are any church admin or pastors that can answer a question about tax credits or if they are worth even thinking about. My circumstance is;

I am a bi vocational pastor that is currently serving as an outreach pastor and fill in at the pulpit at our congregation as well as other churches in our association. I do not draw a salary or receive any compensation so I have never even thought of taking any tax credits for any expenses I incur.

I have recently been approached by a small congregation asking me to take over as head pastor for a modest salary but have already decided in my head that if any church calls me and I am lead there that I will not ask for any compensation because I do not want to be a burden financially on them and due to being bi-vocational I would rather them use any funds they have for me on outreach or benevolence.

That being said, without drawing any type of income am I still eligible for any tax credits or housing allowance and if so would there need to be something written up by the church In lieu of salary or should I not claim any of my out of pocket expenses, housing etc. ?

Thanks for any thoughts or information/advice.