Going straight from kicking into grappling isn't going to work too well. The advantage of kicking is that it gives you distance, which is the opposite thing that you need when grappling. You need some way of getting closer to your opponent yourself or luring him in. For example, you could set up a combo that starts with a kick, then a punching sequence to get inside. You could also wait for him to kick, then trap the leg and sweep. Now you've got a grappling game. Remember, just like in stand-up it is just as important (if not more) in grappling to use the other guys mistakes to your advantage.