What are the rules for re-entering Thailand on a Tourist Visa and how to obtain a Thai Tourist Visa in Cambodia?

So I have a couple of questions.

1) If you fly out before your 30 days is up, how long do you have to stay out of Thailand before you can fly back for another 30 days? And how many times can you do this?

2) I am planning to go to Cambodia for a bit. Are there any recommendations on how to get a Thai Tourist Visa in Cambodia (Agencies that might help)? Any recommendations on where to stay? What are the best days to go to the consulate, are they open on the weekends and how long does the process usually take?

Thank you in advance, sorry for all of the questions. I have been asking people in Bangkok and everyone has a different answer. One of my friends told me to to reach out this group, that everyone here is helpful. Cheers!