Good luck, Laggard. Trying to sort out the confusing variety of electrical connectors used by various manufacturers will keep you busy for some time.

A lot of manufacturers ship batteries and speed controllers without any connectors at all. You're expected to be able to choose the appropriate connectors, solder them in place, and protect the solder joints with heat-shrink film before you can run your aircraft.

I have a bad habit of using Electrifly setups as recommended by Tower Hobbies. I know there's better equipment available, but if I buy an Electrifly motor, speed controller, and battery, they'll all come with the necessary connectors to hook up to one another.