My advice is to avoid getting into any routine when you practice. You need to practice the shots that are giving you problems, and those shots will change from day to day. The tendency of most players is to practice with the clubs they like and avoid the ones they don't. You won't fix your problems this way.
The best time to practice is right after you've played, while your body is still warm and the problems you experienced are fresh in your mind. Provided your round has not drained every ounce of your strength, this is when practice is most effective.
If you're really not having any problems but just want to go to the range for a workout, it's a good idea to break down your typical round of golf to see which shots you need to practice the most. For example, in a regulation round of golf, a scratch player would hit approximately 14 drives, four fairway woods, four long irons (2, 3, 4) eight medium irons (5, 6, 7), six short irons (8, 9, PW), four chip shots, two bunker shots and 30 putts for 72.
Based on those numbers, he or she should spend almost half the time on the putting green, about a fourth of the time hitting tee shots and the rest of the time divided among all the others.
Break down your own rounds, see which clubs you use the most and you'll know what to practice.