This is a good question. Firstly I would say make sure you log in every day and click on the red tabs to get extra VersaPoints.
Also check out the to-do-list and do any of the weekly and monthly activities to earn more VersaPoints.
And enter the t-time draw every hour which will give you two free t-credits if you win. You can use the t-credits to purchase items on TripleClicks or bid on an auction and for every bid you get 1 VersaPoint.