Architects can charge a variety of ways - fixed fee, percentage of construction cost, or hourly. 

A certain percentage of letters are returned by USPS as undeliverable.

I also have limited capital currently 50K, and I'm thinking most Hard money lenders won't lend to newbies unless we put a decent percentage of the project cost.

How do you compute the cash on cash return percentage. 

Here is a comparison of percentage of property tax compared to percentage of home price by county.  

Investors who buy distressed 2nd liens look for notes where the borrower is paying the first lien because these are more likely to get a workout, so selling this note is a good possibility, but understand that these trade at extreme discounts so you would likely only get a small percentage of what you are owed.

Granted, you increase your risk exposure with each property you add, but the percentage of increased exposure goes down with each property (for example, from 1 to 2 properties, you double your exposure, but from 4 to 5, you're only increasing it by 25% - all other things being equal).  

There charge a fee when they rent them so the monthly percentage just goes to these few hours if fielding calls.My main problem is having time to market and show them.  

Is it a percentage of the profits you reinvest and what factors do you consider when deciding how much you will pay yourself as your personal income?

Commission is a percentage of the net profit.