If all you want to do is drag people into guard, then just focus on getting an over hook. Once you get the over hook use the other hand to brace their hip (or head) back and roll back with your legs wide to catch full guard landing with a free new york (or sometimes chill dog).
Personally, I like to use the standup sparring as an opportunity to develop my takedowns so I'll either work an outside single to leg lace, double underhooks to take the back, or try a hip throw off of the overhook (which usually turns into a mess and I end up pulling guard). Sometimes the best way to start is just to find a takedown that looks cool, and then try it, seeing if it blends with your game at all. Then just keep developing and adding stuff.