Get your knee between the legs anyway you can to start.
Drive your knee over the leg to the matt while simultaneously getting an under hook on the opposite side of his body. So if you are passing to your left, you need to underhook his left arm with your right arm. THE UNDERHOOK IS EVERYTHING. Don’t start passing without that underhook.
Drive hips forward and almost baseball slide into judo side control and get good control of his side before continuing.
Drive shoulder into his chin to make it uncomfortable for him.