Making goals..

Just been having a think about making some goals for 2014 seen as it is fast approaching.. I was wondering how people go about making goals and how they make them realistic and reachable? I want to push myself as much as possible but I don’t want them to be impossible, I feel as though making goals will help my motivation but was just wondering if anyone had any advice or tips?

Do I make them weekly, 2 weekly or monthly? Do I go for goals regarding just my weight? Or do I do it by inches or what?

I’m a bit clueless where to start and if anyone has any plans they are willing to send me or apps they may use I would greatly appreciate it!

Plus I am interested in what you plan on doing to better yourself in the new year, whether it be weight related or not?