I am making a project that is a 'Bomb Diposal Robot' need help with components

What components do I need?

I got a gripper and a continuous track with wheels inside them. What else should I buy so I can make this functional?

A book on how to build robots. Plus books on electronics and Arduino programming.

… and you will need a lot of bombs for real world testing.

CompetitiveTrash: What else should I buy so I can make this functional?

Depends, surely, on what you actually want it to do.

If you want it pick up something the size of say a bar of chocolate and drop it in a bin that's one thing. If it needs to carry something the size and weight of a bag of cement, that's another thing. If you want it to autonomously distinguish between red and blue wires and snip the red one (oh wait, or is it the blue one....) that's yet another thing.