Want to become a 1st time mommy. Where Do I even start with finding a donor/ IVF?

Hi Everyone! I am new to this site/ group. I stumbled upon it when I was searching "having a baby with a donor". I am a 35 yr old single women who really wants a baby. I have so many questions and have no idea where to even start. lol.  This site looks like a great site where I can get great advice and good info.  Can anyone suggest or give me advice on what to do first and where?  How do i know i can trust a fertility center? Are there certain things to look for? Also, how do I know I won't get the wrong donor? I guess the main thing is when I am start trying to choose a donor...who can I trust?  I started looking online to get an idea for donors and it is SO overwhelming which makes it discouranging too. I guess there are a 1000 things running through my mind and it is a little overwhelming. So any suggestions, advice and information you can give for a women who wants to start the process for the 1st time, but has no idea where to start.  Thanks so much! Dena