Take him down. If you cannot take him down, pull guard. Use your guard to sweep (or submit) and get on top. If he takes you down, you need to escape the pins to recover your guard.
Once on top, pass his guard (pass his legs) and establish top pins. Use dynamic pins (navigate between the different pins) to have solid control. Once you secure the position, isolate his limbs to get a submission.
Always aim to get behind his elbow to get his back and work to strangle.
