Motivation is what gets you started. Habit is what keeps you going. So how do we create new habits?

What I do is I set big goals, and then I figure out what small goals I need to accomplish on a daily basis to reach that goal. Example:

Big Goal - I want to lose 20 pounds
Small Goal #1 - I will eat 1200 calories every day
- Smaller Sub Goal #1 - I will plan and document weekly menus
- Smaller Sub Goal #2 - I will pack lunch for work every day to ensure I stick to my calorie count
Small Goal #2 - I will exercise 3 times a week
- Smaller Sub Goal #1 - I will go to the gym right after work to ensure I don't get stuck on the couch
- Smaller Sub Goal #2 - I will try one new exercise every week to ensure I don't get bored

This approach will make your big goal achievable. To make your small goals into habits you need to combine them and integrate them into your life and current schedule. These will make the habits "sticky" and easier to create.