Don't bite off more networking that you can chew. A network you don't complete is money wasted. Even a small network will save money and you can always expand it later if necessary. You don't need to have a vast knowledge of computers to repair system problems. Consultants fix many problems with careful observation and patience, not with technical expertise.
Networks require consistent care.
Perform maintenance tasks as often as required to assure worry free operation. Always look for the low-cost solutions to your networking problems. For example, alternative networking technologies provide flexible networking support for home offices and other small networks. Use the right networking technology for the job. Avoid getting a central server unless you need one.