Haha...it isnt really that easy :P

Right now, it seems to be use wrestling to take them down (single or double leg takedowns) and then use Jiu Jitsu skills to submit them (Kimura/keylock, rear naked choke/sleeper and armbars tend to be the most popular (and easiest to attain) submissions).

Judo uses many techniques similar to jiu jitsu on the ground, so you'll learn plenty of submissions there. And Judo will teach you enough takedowns to get the job done.