Tennis doubles strategy:
One way of creating confusion and uncertainty in your opponents' mind is crossing when using a regular doubles formation. You need to agree in advance whether you're going to make the switch. Doubles teams usually cross when serving, but you can also do it when returning. Even when you're not crossing, you can 'fake' a cross, making the other team think you're about to move - they will be even more unsure of what's happening and where they should play the ball.
Keep changing it up. Use the standard doubles formation with and without crossing, and also play some points with the Australian formation.
On the doubles court, there's more opportunity to play to your strengths and to cover your weaknesses. Let's say your forehand is more of a weapon than your backhand. Choose to receive from the advantage court (this is assuming you’re right-handed so the reverse is true if you’re a lefty). And when you're serving, you can ensure you play more forehands - when you're serving from the advantage court, stand very close to the 'T' and immediately move to the right and into the deuce court after serving. Your partner will already be on your left, ready to cover the advantage court.
If you're not very comfortable at net, that doesn't matter as much in doubles as in singles as you can rely on your partner to hit most of the volleys.
While playing to your own strengths, you should also be looking to exploit your opponents' weaknesses, and stop them from using their strengths.