Lake homes come in all shapes and sizes, but all were bought with a purpose. Some are primary and many are secondary homes. It's not your normal purchase or sale... you need an agent that can help you understand value and is familiar with the lake.
Factors of value include: location on lake, amount of land along lake, lake view, water depth, private or community dock, type of dock permit, slope to water... and the size/quality of the home.
All these factors come into play when buying or selling. Other factors in many cases include: water from a well, septic tanks, propane, questions for the Army Corps of Engineers.. such as water levels. Click on link above for general information about the lake.