I've never been high on that market, personally. 

Make sure that your LLC structure is solid, with proper insurance coverage in place, to protect your personal assets from any potential issues related to the rehab or the property itself.

Please help a first timer who is just starting to learn about tax lien certificates and has a bit of interest. 

I know you want to invest, but you need to go to some local meetups and meet other investors face-to-face, learn what you really want, and as others said, do not buy a new build to rent.

I did learn, however, and I flipped a house successfully. 

Return on capital invested ~375% Lessons learned?

Sold for $385,000 Lessons learned?

Cash Flow is $280 monthly Lessons learned?

Sold for $385,000 Lessons learned?

This person should have some contractors to recommend to you.