This will generate earned income which would be eligible for a solo 401k.Talk to your CPA.Best of luck

Anyone having success with Facebook ads?
If so, whats your technique?

Assuming you are using a different servicer,  The seller will notify the servicer of the sale and they will generate the goodbye letter and send it to your new servicer for approval.

Selling rental property in Honolulu and hoping to re-invest it via 1031 exchange in a rental that generates more income.

This is all just from good customer service, keep in mind.

I use one as a shorter term rentals and its often generated over $2,000 a month. 

Why would you not pay monthly as is custom?

No school debt, on the job training, and a skillset that would give you good income when you work for a customer/employer, and significant labor cost savings on your own properties when you can do the work yourself.

It is always has a vast potential income-generating asset and provides a better return.

Therefore, you will see the different sides: customer service, maintenance, collections, screening, renewals, leasing, IT, etc.