Ok so I'm reading a lot about loans and trying to figure them out, a couple things I can't figure out for the life of me, was hoping one of y'all could help me understand!1. Why would a bank loan out money at a 4% int...

I am sure you have read if you obtain an FHA mortgage your minimum down payment on 1-4 units owner occupied remains at 3.5%, however with conventional more than one unit you would be looking at anywhere from 5-20% down (depending on programs in your area). 

@Leslie Eason, talk to other experienced investors around you. if you do a conventional mortgage, you will need 25%-30% down and also want to have reserves for the repairs that always pop up at inconvenient times. 

I love the strategy of small multifamily properties. 1 roof, 1 foundation, multiple tenants :)In the Charlotte market, this strategy is VERY challenging, just because the inventory is much more limited than single family/townhouse/condos.

I am pre approved for the first home purchase with a conventional loan.Thank you for any guidance anyone may be able to provide.Best,Lisa

There should be plenty of inventory.

Conventional investment loan, 20% down.

Is it acceptable to use personal credit line to fund a down payment on a single family rental on a conventional loan?

Yes you would have to refinance to a conventional loan first, and then use an FHA loan on the new property.

@Nick BrubakerIf you get a conventional/Fannie loan, they now allow you to transfer into a whole lot owned single member LLC with no due on sale issues.