How do I qualify for a 4 PLEX I have the down payment & credit

[Mark Sam]

How do I buy a 4 plex in Texas, or anywhere I am willing to move where is best I though Texas is best. I am moving from California. I have a 750 credit score. I have the down payment available of 600k. How do I get banks to qualify me for 20% down though, I want to use little down. How much income do I need to qualify for the mortgages? I want to do residential financing moving every year buying a new 4 plex & living in it never selling. My tax returns are 0 for the past two years because I was in university, should I keep pursuing a degree in Computer Science or do a job to get my tax returns up to get financing. Again how do I find out how much I need to qualify for the mortgages?