With 20% down you should absolutely be able to find a 30 year fixed rate....although, I don't know your financial/credit situation...but getting a 30 year fixed rate, especially early on, will help you qualify for more deals in the future. 

That said, please be sure to follow forum rules and not solicit in the forums outside marketplace or spam via the message system, both of which are against the terms of service here.Based on your initial post, it sounds to me like you have more to offer than most so in my opinion, you have a better chance since you have the skill set AND some skin in the game!

Let's say that you want to buy land and build a fourplex, however, you are newly self employed, and you won't qualify for mortgage loans for another 2 years, since banks need a 2 year tax return history. 

I'm looking to get pre-qualified for a loan, shop lenders, connect with agents, and find GOOD DEALS.

If your primary is 600 sqft, I am not certain an 864 sqft additional structure would qualify as an ADU.

Only works with qualified tenants. 

There is a new 20% pass through deduction you may qualify for that could help you, but not everyone qualifies.These are all things you will want to discuss with your attorney and CPA. 

Most portfolio lender also like to see that you have some "skin in the game". 

I should've mentioned....if you wanna know more.... please PM me.I'm probably gonna get crucified here on this board for talking about this ... soooo... ;)

This model was originally developed by the credit industry - for instance, a car dealer only wants to mail to people likely to qualify for a car loan.