Hey,
I'm new to tax return preparation after 8 years at the one of the big4 assurance departments. I want to start doing tax returns for friends and relatives for moneys (very limited). As of now I have 4 potential client in 2020. I want to start as sole proprietorship. I registered and received a PTIN. I have read that I don't need a EFIN as long as I don't exceed the 11 tax return threshold a year (in 2020). I file tax return for foreigners (federal tax returns only - no state). 

My question is - 
what should I place as Firm's name and EIN? leave it blank? I'm not associated in any sort of a business (act as a sole proprietorship). 

Thank you,