With the appropriate education, you can start today and partner up with people that do what you're looking to do.

Would a HELOC be appropriate in this case?

When it comes to eviction..... when is it appropriate to get LEO involved?

Some people will operate each child series from different bank accounts, others will use a single account and "earmark" funds appropriately.

It sounds as though you have worked very hard to build up equity, so it's important to take the appropriate steps to protect that wealth. 

This has thrown you a curve too as the property manager, so I hope you'll be compensated appropriately for the extra work you'll be taking on. 

The $100k is easily traceable and will be assigned asset lives as appropriate for tax. 

Properties priced appropriately move briskly...and a 203k loan has a very long closing timeline, that often falls apart, so no listing agent is going to accept a contract with one if the property is already appropriately priced.

The answers provided are all appropriate, with the splits and such varying by scenario.

Start with where you are and then take appropriate steps toward where you want to be.Good luck!