Got a self directed 401K, now what?

[Stone Jin]

We are looking to open a self directed 401K to invest in more real estate.  There has been lots of posts on BP about the benefits and how to set it up.  However, we are looking for information on what happens after you open a 401K.

Question1: Can the BRRR method be used with houses owned by the 401K

Question2: Is there anything different about buying insurance for the home?

Question3: Once the 401K account is opened with checkbook control, do you need to open a bank account?  Does someone typically just write a check from 401K to bank account to fund?

Question4: If a bank account is required, can a debit card be used.  I read somewhere that credit cards are prohibited.

Question5: If a bank is not required, is there a way to get a certified check from the 401K?  

Thanks in advance

Stone