Real estate investing has been a passion of mine for time with my mother also having invested early on where I likely have gotten the love and desire to follow similar foot steps.I have taken last 6 months to educate myself and currently own a single family home as primary residence and would like to expand to multi family properties (2-4 units) for additional stream of income, not to mention potential tax benefits for long-term investing.Based on current living situation, I have a fair amount of equity established in my primary residency along with having enough cash to either pay off house completely or use towards investing in a multi family property.Given that I'm the sole source of income for our household with my wife being the home maker for our two kids under 2, trying to weigh out risks with getting started now or perhaps waiting. 

single family or multifamily?  

My family has been active in the Las Vegas real estate market since 1989 working mainly in single family rentals. 

How are guests responding to the multiple units on a single lot or is it a larger piece of land?

We have a single flat fee of $1,500 for all of our fees, including the appraisal/valuation.

if its a single family you'd get an appraisal called 1004 as is + arv . if its a 2 to 4 unit you'd get a 1025 as is + arv appraisal .

DSCR or Fannie/Freddie loans can go up to 75% on single family homes, multi family homes (2-4 unit) max at 70% if you stick with Fannie/Freddie.Other things to consider would be:Paying points for a lower rate vs higher rate with no pointsIf going DSCR - Prepayment penalty term (0-5 years)The lower the loan size ($200-250k and lower), you should consider paying up to 2 points and doing a 5 year prepayment penalty if going DSCR.

Typically, the same applies to LLCs where you and your spouse are sole members (single or multiple member LLC).

For rentals, would a single floor or two floors makes sense? 

Unless you're working with Private Money that is going to carry the risk of your lack of experience, banks want to see experience, Net Worth and liquidity after close to consider the terms.I started with single family, four plexes, and remodel flips for a lot of years before getting into larger deals.