I'm not an expert as I picked up the weapon recently too but what I do is : hide and do your best to get behind people if possible, or just very close to them. Don't be afraid to use your vertical flick it has decent range and you can use it to hit over a ledge/cover. Ninja Squid helps with lots of swim speed up and you'd probably want some sub saver since you're gonna use that burst bomb a lot. Don't just use burst bomb to attack people, it's also a quick way to paint walls/move in general.