Is anyone aware of any part-time opportunities where I could learn from an experienced investor and offer digital marketing expertise or other skills in return (social media, website design, ads, etc.)? 

I live in Kansas City, MO and work from home as a digital artist in the sports industry with a bit of freelancing on the side. 

Since I invest in notes where I can get double digit returns, for me to buy a property the returns need to be higher than what I can get a note for since a note is mailbox $ and do not deal with tenants, toilets and termites.  

Note that most direct mail campaigns send thousands of pieces of mail (based on a mailing list...of absentee owners, for example), with very low response rates (in the single digits at best). 

--my returns are not double digits.

If you can spend more time, more money and get massive results then you should follow these.Create a website must be PROFESSIONAL have a blog and get someone to write for you add at least 2 posts a monthBrand yourself or your company and give some value it could be FREE EBOOK, VIDEO ADVICE, TIPS, or anythingReach to people as much as possible (STOP THINKING ABOUT LEADS FOR A WHILE) connect with more people show your interest share valuable stuff.Try to use Facebook, twitter, instagram, as well as linkedin gain good number of followers and audience share interesting thingsBuild an email list within your niche that could help you to connect with more business people and investors who trust you.

I set the guest's entry code to the last 4 digits of the booking cell phone number. 

Why are books only available in audio or digital format in your store but available in paperback at Amazon?

I believe that online (digital) marketing is the way to go.

VA's, endless travel)  Yeah I'm sure that he has inspired thousands of travel bloggers and digital nomads.