Squirting is definitely real. Here is the best advice I can give you from my experiences and what I know about the physiology of the female prostate (urethral sponge) and how you can stimulate it through the g-spot area. Squirting takes a lot of practice and knowledge about your body and ultimately a deep comfort with the fluids it produces. Getting the right stimulation is important but learning to relax is key.
The g-spot is located about 1-3 inches deep on the front wall of the vagina. Its best to stimulate it by applying A LOT of pressure and a "come here" type motion. This can be done with your fingers or a partner's fingers or a good toy.
When you stimulate the g-spot you should start to feel a sensation that feels remarkably similar to the urge to pee. This happens because the g-spot is a region of the vaginal wall that is located directly over an organ called the urethral sponge or the Skene's glands. The Skene's glands can also be stimulated by clitoral stimulation as well since they encircle the urethra on all sides (it is typically easier though to stimulate it more directly through the g-spot). This structure is made up of thousand's of tiny glands and ducts and it will swell and engorge with fluid when it is stimulated. As the urethral sponge swells it applies pressure to the urethra. Expansion of the bladder also applies pressure on the urethra so the nerves that pick up this change in pressure signal the brain in the same way needing to urinate would. This is why the urge to ejaculate feels so similar to the urge to pee. If you are worried about peeing you shouldn't be. Urinate before you play so you don't have to worry about it. You will still ejaculate large amounts of fluid.
As the "need to pee" sensation grows stronger it will crest and you'll start to feel slightly tingly. At this point you are very close to being able to achieve orgasm. I know I personally need to add clitoral stimulation though if I am to reach orgasm but I know some women can orgasm without clitoral stimulation. Try adding the clitoral stimulation if you are having trouble. When I add clitoral stimulation (usually by use of a vibrator on my clitoris) I allow my body to relax deeply. To ejaculate you have to relax deeply and let go allowing the fluid to flow out of you. It feels similar to how you relax when you urinate (the same muscles are used). This is the hardest part of the whole process. Most women don't get past this point since they typically clamp down because they are worried about peeing. It takes practice so keep trying.
Once you relax her muscles the fluid will start to flow out of you. A half second later the orgasm will begin. In my experience ejaculatory orgasms are incredibly strong and envelop the full body rapidly. It starts in the pelvic region and then spreads quickly up the body and all the way to the limbs. It happens so abruptly that it feels like getting hit by a bus. Extremely intense contractions of the pelvic floor muscles will follow orgasm.
Squirting takes some practice and it takes some time to learn to get the orgasm and the ejaculation timed together. I don't think my orgasm and ejaculation were simultaneous in the beginning. I can't remember exactly though because I was so excited the first time it happened I was euphoric anyway. Keep practicing and learn to really relax.