New to real estate investment

Hello,

Im new to the real estate investment world. I have read a few books by barbara cocoran/bruce littlefield, joshua darkin, dave ramsey and william johnson. Im trying to gain as much knowledge to better educate myself. So far the areas im most interested in is flipping houses, buying multifamily homes (possibly live in it for a year or two, rent out the other section until im ready to rent both sections), rehabbing. 

I know a person that I been picking their brains for advice which they have been great with sharing information. However I decided to join BP to gain more insight. 

Also do I need a real estate license? I plan to buy homes with cash. 

Please feel free to share any advice, experiences on your first time getting into real estate investment. 

Thanks,

Kim