I have a car already. I am buying a murfdogg synergy 1.1 17.5 and a hobbywimg justock. What do I need to buy to connect the two? Do I need to buy wire? I have a soldiering iron. Do I need bullet connectors? Tell me haha.

Best option is a direct solder from motor to ESC, if that is not an option because one or both do not have post to solder onto I would suggest some good 4mm bullet connectors. There are a lot to choose from but a set of castle connectors may be the simple ticket if it comes to that since they come in a set of three with male and female.

You may need to buy a sensor wire, I don't believe the justock comes with one and not all motors come with one either, check on the murfdog motor and see of it comes with one the correct length you'll need