There is no Down Payment until two parties sign a Purchase agreement.There are 3 ways the investor makes money doing a Sandwich LO. 

I deal with jeremy chromik at LO

This is my first time selling a house so I’m not sure if I need more manpower outside of the LO so any advice would be appreciated as well.

A good LO will know their stuff and will be able to tell you 99% if you are good or not.

Consider a solid LO a win and forget trying to control seller proceeds when you exercise and buy. 

I do have a mortgage broker that helps me screen the tenant buyers that apply for the home I am controlling via a LO.

The largest obstacle I'm facing now is the scalability, which is notoriously S L O W if you're looking to acquire properties or portfolio's with traditional savings from your 8-5; I've been exploring SFR portfolio listings as well as apartment complexes and I'm looking to connect with investors either in a similar situation or that can provide advice on making the jump to larger investments. 

The same training by the LO/WLO eductors works for sub-to, its in the negotiation where you end up.   

To @Lien Vuong point, your LO will need to have a conversation with underwriting on "why" you're moving, etc. but it shouldn't be an issue.

So you need to learn learn learn.FWIW I no longer will do sandwitch LO's.