One of the biggest time management mistakes you can make is to turn your calendar into a simple list of meetings. By not listing the important non-meeting work, you relegate such actions to a secondary status. By not having categories to trigger your memory and to assist in setting priorities, you facilitate drift.
There are plenty of great time management systems out there, such as those by David Allen and Franklin-Covey. Here's a very simple one: Review the actions that you plan to take this week. Put them in key categories such as David Maister's Minding, Finding, Grinding or a more detailed list of your own design. [My own system includes Projects, Marketing, Maintenance, Writing, Exercise, Personal, and Comments.]
Have one page per day so you aren't forced to scribble details in a small space. [Fancy pages are not necessary. Print your own forms on your computer if need be and keep them in a notebook.]
Underline the actions that are tied to a major goal. Don't con yourself and pretend that minor actions are significant. Don't get distracted by treating everything the same.
Make sure that you have enough goal-related actions so completing them by the end of the week will have produced serious progress.
Don't just book meetings.