There are not thousands of firms selling notes to investors, it is a select few and those in the business already know who they are.Is it possible to find a note here and there to broker - yes but I don’t see how someone can make a full time business out of it and make it profitable.

Using an online Lien Filing Service or Law Firm?

Have you called any architectural firms?

Using Podio or other free CRMs can host the API calls. 

Wire transfer at closing, wire to law firm both of those will work if you can't get into the US to physically sign for an account.

I have found a few potential firms, but curious to hear about other people's experiences.

Rebecca I work for a real estate investment firm called New Western Acquisitions, were I've helped investors locate and target areas to maximize their money doing flips.

I host a multifamily investing group in Richmond. 

Does any one have any resources of Airbnb property managers who can manage , list , and host my property for me while I am out the country

If your clients can get 30 to 40 leads a week, on a $99/month budget (cost of hosting my site), I will happily admit social media is better than SEO.