What systems to develop for "Newbie"

[Victor Cooke]

I have been reading the "E-myth" and it has gotten me to think about the how/why for developing systems. I get that everybody's systems will be different based on what they do, but was looking at which processes I should develop systems for as a "newbie". Currently, the systems would be for myself and my wife to use so we can stay focused and to try not to shoe horn a deal just because we like the house. What systems have been helpful in developing for your guys/gals businesses?