You can get many good and inexpensive packs with EC5 connectors those are just 5mm females in a housing, so if the males on your esc are regular straight males you can easily plug them in. Low profile males usually have a wide base for soldering to the wires, those could get too close to each other; in the latter case I'd rather change connectors. Surely you'll find someone at the track or in a hoby shop do help in case you don't feel ready for that.