Female ejaculation (also known colloquially as squirting or gushing)
refers to the expulsion of noticeable amounts of clear fluid by women
 from the paraurethral ducts and/or urethra during orgasm. The exact
source of the fluid is debated, although some researchers believe it
originates from the Skene's gland.

There are no standards or rules for this occurrence. It may appear
as incontinence or urinating during sex, specifically during orgasm.
 Or in some women's cases, they have always been "very very wet"
during arousal and climax. 

Here are a few tips:

1. Empty your bladder first. The feeling just before ejaculating is similar to the feeling you have when you have to pee, but you want the urge to come on as a result of arousal and not a full bladder.
2. Practice in a comfortable place. This suggestion is very important so that you are relaxed and ready when the feel the urge to "release". A few places to try to practice may be in the bath or while sitting on the toilet. The main thing is to drop your apprehensions and literally "go with the flow"! 
   
3. Usually ejaculation will come on as a result of stimulating the paraurethral glands and/or the g-spot (urethral sponge).
4. Stimulating the g-spot for any length of time will be easiest to do with a dildo or vibrator. Any toy that is firm, or one that is curved for g-spot stimulation will do. Use a lot of clitoral stimulation, but also stimulate your urethra by massaging inside the top of your vagina both around the opening and inside a few inches. Many women find urethral stimulation very pleasant in and of itself. Keeping up the clitoral stimulation you may also want to try and stimulate the g-spot . 
5. Vary the strokes and the pressure and experiment with what feels good. As you are doing this you may feel the urge to urinate (along with feeling very excited and hot!). This happens just prior to ejaculating. At this point as we said before, just "go with the flow" and let it all out.