How to Structure are Business to maintain and grow very big?

[Joshua D.]

lSo its me and my wife that own are real estate business. We buy and hold properties, me manage them and do all the work. We have contractors do the work and maintenance requests are sent to them or handymen to get stuff fixed when able and we literally do it all. So my question is how to structure this correct with it all my wife does the bills and quickbooks and i over see it all and find the deals and make sure the work is getting done and anything else that needs done. Should we hire employees for anything. Maybe 1 full time guy? We dont get alot of issues but as time goes on we are getting a little scared with it all. We have 21 units, 15 sfh's and 3 duplexes. Im gonna attach my websites and if you have any questions regarding are business model please ask. Would like to really grow this but dont wanna kill ourselfes trying to get there.  I think everything is set up pretty good. unfortunately we dont have a property management company around. 

Please any advice would be great.