Starting RE investing with old 401K

[Roland Brown]

I am extremely curious about moving my old 401K (prior employer) into an account to start low level lending, note investing, etc. I would like to see if anyone has experience doing this and how it has been so far. 

What kids of Fees should I plan for during the Roll over process?

What kind of account maintenance fees are there?

Is it beneficial to move my funds to Roth before I start investing?

Where are good places to start note buying, and lending?

I don't command  a fortune but I would like to leverage what I have to learn the business. Are there common pit falls I should be aware of?

Bonus Question:I also want to move into investing by way of BRRRR with separate funds. I do understand that comingling strictly forbidden and actually see benefits to having the two activities separate as it creates Silos for the activity. Do the Attorney and CPA I use have to be separate?