Are there any best practices on the max % one should increase rent on a new lease? 

Networking is always a great practice and you never know who you might meet there and what good information they have to share.

Quote from @Edward Dandrea: Best practice is to get confirmation in writing, even by text or email.

It takes practice to have them, but not having them can lead to further issues down the road.I would arrange for a "semi-annual" walkthrough to inspect the unit.

While indemnification provisions are good in theory, there are times where it can be tough to enforce them in practicality.4. 

I'm no attorney but I've seen attorneys make mistakes - especially when they operate outside of their area of expertise, in fact I see it all the time.

Typically most CPAs will have the expertise to help those in the same boat as us.

@Whitney Griffith, One Rental at a Time has great content on this and has a recurring guest whose expertise is cost segregation and depreciation.

Written by attorney investors, it's full of practical advice pertaining to management of investment property, has sample forms that can be edited, and - most importantly - they tell you what your primary state laws are and where you can read them.

I personally totally agree with the point that if you learn study and practice you will succeed.