Good workouts for grapplers

So I'm hoping in a year from now I'll be in a place where I'm able to join either a BJJ or Judo dojo. In the mean time though, I want to gain some muscle so I can train at my best once I join. I'm currently 5'4 and a measly 105lb (that's 7.5 stone or 47.6 kg). That's not exactly great for not getting thrown around in my previous experience :bang:

Does anyone here know of any workout routines that are specifically geared toward grapplers? Or simply specific muscle groups I should focus on?

Thanks friends!