Hai, there are numerous apps in the US to pay for things that are much easier than Interact nowadays, such as Venmo, Zelle, CashApp, etc and of course PayPal. 

The BRRRR method has been used successfully for years by numerous investors. 

I’ve ran into a lot of headaches on numerous rehabs but it was all a great experience in the end.

That method has worked good on concrete, bet it will work on the frame   lumber supplier is a very good way , sometimes the answer is too simple to think of for me.

I've used Gerber's Viper toilets in the past, but my supplier doesn't carry them any more.

Be patient with section 8 applicants, had numerous inquiries and appointments set up but when it came time for them to come see the property a majority of them would go silent or not show up for the appointment.

For vacancy, set up numerous appointments at once, or hold an open house.

A non-home depot supplier may get you a 30 year warranty quality window for only $300 if it is expected to be used a lot.

For the kitchen and bathroom remodel, if you have a bit of a discount from suppliers you can do a nice kitchen remodel for around $12,500, low end for around $6,500, bathroom remodel for around $4,000-$5,000. 

@Andrew Ralston check out meetup.com as there are numerous real estate investor meetups groups.