Decide how you want the log cabin to look, both from the outside and the inside. There are various options including color of the logs, size of the logs, round versus square logs and milled or finished logs and natural logs. Each will give a particular look and effect.
The corners on a log home are also important. There are three basic corner types, overlapping, intersecting and interlocking. Depending on the look you choose for the outside of the house, corner selection is very important. Drive around and look at the full effect on a house to really get a good idea.