I suck at teaching but I'll try, TreeLiz.
Something you can try that could really help your guard game is to getting an overhook. If they're in your guard (assuming you're right handed), get a deep left overhook then scoot your hips out to the side so that you'll be laying on your right side. Your left leg should be high on his back while your right foot will be on his hip. Keep in mind you should be constantly squeezing your knees together at all times.
From this position you've done a lot of things:
1)break his posture (that's the hardest part of guard I think)
2)given yourself HUGE freedom of movement
3)trapped one of his arms.
From this position you can just start attacking him. Some of the attacks you can do include the triangle, omoplata/gogoplata, and armbar.
Triangle
The most obvious one, keep your over hook and have your free hand grip his left wrist, and force it either away or into his hip. From there, throw your right leg over and voila, triangle!
Omoplata/Gogoplata
This one should be rather obvious too. Get your left shin/foot as close to his head as possible, then with the aid of your right hand pull that over his shoulder and across his face.
At this point, if he decides to lift his head and expose his neck then shove your shin underneath his chin, square yourself back up with him and pull down on his head for the Gogo.
If he keeps his neck well protected, figure four your legs and go ahead and set up the omoplata.
Armbar
The armbar is pretty simple but gets tricky. With your deep over hook, loosen it a little bit and slide it down and relock it as close to his elbow as possible. From here, (make sure you keep that over hook tight tight tight!!!) inch your shin/foot close to his head and pull it over his should and across his face (like setting up the Gogoplata or Omoplata). From here just arch your back and try and finish that armbar.
-------
I know what I told you isn't some super secret way to having a good guard but sometimes trying new things help you understand more about the mechanics of the guard and understand what you weren't doing before that could be critical.
This "set-up" from guard I've taught to a little beginners and they seem to have epiphanies about their guard since it helps cover a lot of details they missed before (breaking posture, never lay on your back, etc.)
So just give this a try next practice and tell me if it helps you out at all
.
Hope you understand what I wrote.