In doubles, when your opponents hit a lob over your head (while you are at the net and your partner is in the backcourt) what should you do?

Cross over to the other half of the court and move back to the baseline. There you can see how your partner handles the ball and also see where your opponents are. If your partner can return the lob with a lob it will give you more time to cross over and move back.

In doubles, when your opponents hit a lob over your head (while you and your partner are at the net) what should you do?

Initially both you and your partner start moving back for the ball. After 3 or 4 steps, decide which of you has a better play on the ball. Call for the ball loudly ("Mine") at this time. The player calling "Mine" plays the ball, while the partner takes the remaining half of the court behind the baseline. Again, a high lob return works well here.

Where do you go after you successfully lob over your opponents head?

Both you and your partner should attain a position near the service line. From there either of you can cover a deep lob return with an overhead and easily move in to the net to make an offensive volley. Remember, always follow your successful lobs to the net to gain the offensive and keep your opponents on the defense.

Where do you go when you or your partner hits a short lob to your opponents?

No matter where you are in the court when you or your partner hits a short lob (and your opponents are getting ready to hit an overhead), both of you should move back behind the baseline as quickly as possible. From here you will have more time to return the smash, plus you will not be such an easy target for your opponents to target!