Need some direction

Im looking for some advise from some people who have been in my shoes.I built houses for 15 years working for hourly wages.As of the beginning of this year I quit my job and went on to buy my first property.I fixed it up,sold it,bought another and am going to rent it out.also bought another that i am also going to rent out.The houses i bought i found on the mls.I Have got my builders license,and can do anything to a house to improve it.I am a newbie at this but want to make sure im going in the right direction.Any advise on books,tapes or anything that would help teach me to make the most money in a short time would greatly be appriciated…