There’s no specific “method” to squirting. Honestly, it’s not even medically proven that every woman has the ability to ejaculate. I have heard, however, that it takes a lot of experimenting to find what will make it happen for you personally.
The most common denominator is that it involves a VIGOROUS stimulation of the clit and the G-spot. Once you’re worked up and wet from playing with your clit, you move to your G-spot. Use your fingers in a circular, steady, aggressive, pace to stimulate the G-spot. You can just use your fingers, but adding toys to the mix makes it easier though.
It often happens after your first orgasm, so this isn’t a one-off, it might happen in between your second or third. Just because you ejaculate, doesn’t mean you’ve had an orgasm yet. It’s a different kind of experience. Most women say that you know when it’s about to happen because it almost feels like you have to pee. The key is to ALLOW that to happen. Squirting seems to go hand in hand with very vigorous, rough, sex.
For more specific details try reading this:

Go hard, get wet.