Thinking about IVF

I am 27 and I have had a tubal ligation in 2020 had 2 c sections and endometriosis removed twice, I want a reversal but I am afraid with all that above I would have alot of scar tissue and may blocked my tubes. So IVF is my next route. I am in between either natural or mini stimulation. My partner is 44, but he should be fertile as he has 8 kids previous to me. (Please don't judge, age is just a number and I am truly in love with him and makes me happy). When I was trying to get pregnant b4 with my kids dad I had to take isoflaves to stimulate to ovulate and when I took them I got pregnant so idk if I have to need medication or not. Please help me. And what is the process