I am not familiar with Waveapps but I can only imagine they have a classification for "owner contributions" which would show an increase in cash (asset) and an equal increase in your equity in the LLC. 

But generally if you contribute no capital, it is generally better to just get paid for your work instead of getting a percentage. 

If so the rental from the other side contributes to your mortgage, thus paying down your loan.

Save as much money as you can, invest in your TSP (at least 5% to get your matching contribution) but I would recommend a lot more...your TSP counts as cash reserves for mortgage brokers, and makes for a wonderful emergency fund for rentals...plus you can roll it into an SDIRA down the road and invest with it as you see fit.TL;DR - Lots of opportunities, learn as much as you can, build a solid financial foundation, and take action!

They won't be able to provide liquidity on their own, they'll have to do a capital call, which isn't good for investors.It took investors' time and energy to make their initial capital contribution, so they'll effectively be out time and energy as well, but they are also giving up control over day-to-day decisions that drive their potential to make a return.If they were getting a loan from a bank, said bank would most likely require the sponsor to have money in the deal net of acquisition fees.

If I'm thinking of holding, I'll cross-check with Rent Cafe, Trulia, Zillow, my broker, and others.

Thinking of contributing 50-100 000,- as a down payment on my first property.

@Steve LegnaioliSteve there is defiantly an opportunity to the extent that your facts and circumstances meet the requirements for these contributions.

Because your over 50, in an Individual IRA OR ROTH IRA, you can now contribute $7,000/ year.

@Kenneth BurkeIf you document clearly in your books that the money you received from your home mortgage was then contributed to your LLC and that the money is going back from the LLC to you as distribution before going to pay the mortgage that should be fine.Another option would be to have your LLC assume the mortgage and document it as such in your books.What would create problems and commingling would be your LLC paying the mortgage without receiving the funds to start with.