Good for you starting at 19.

What I usually see is that they start with the average $/sq.ft of the sales price in the area.

As you start changing HVAC, windows, etc your budget certianly goes up.

This started my thought process that maybe I should sell. 

Your choice:1) Because of your failure to prove you have obtained renters insurance upon moving in this is your 5-7-9 (how ever many days required in your market) notice to cure the problem or leave the premises at the end of the month. . 2) Because you have failed to provide prof of renters insurance upon move in a policy will be provided for you starting March 1st through insurance company X at a cost of $xxx.xx.

Also, that idea might have been inspired by the recent jump in American purchases but we know that that was temporary in order to take advantage of the Golden Visa before it is phased out.I doubt even more that anything like this will make its way to Portugal anytime soon.

What steps should I do to start this?

Start building relationships with retirees who want a better return on their money.

Take a look at this podcast from BP - it goes over Beginner friendly ways to start investing and you will take alot from it. 

Always willing to jump on a call.