Another SDIRA SD 401k question

[Thomas Dowell]

I'm a new member here on the forum and have a couple questions about SDIRAs and SD-401ks. I'm just starting my career as an active duty military member but I also independent contractor work as a flight instructor so I'm not sure if I qualify for a solo 401k or not? I've got approximately 15k in my Roth, and as I understand it I can use that as a down payment and get a mortgage on a buy and hold property? I'm very much oriented towards long term wealth growth and cash flow as passively as reasonably possible. I've had a mentor suggest liquidating my Roth IRA to buy a rental, but I don't see why I would do that if I can just buy and hold under the tax shelter. So I guess I'm just seeking some general advice on where to start, and if starting with an SD Roth is a good idea or not. Thanks!