Id like to preface this by saying im cis female so take everything with a pinch of salt, please 
There is a great thread on prostate orgasms on here that has lots of good tips. Obviously some of it will not apply 1 for 1 to you, but I’m going to link it incase you feel its worth a look.
P-spot orgasms
Im wih everyone else. Even if your anatomy where standard, i would recommend exploring your body as we’re all wired a little differently from each other.
Pick a time when no one is going to interrupt you or walk in on you and you can just relax and take your time.
Go slow, concentrate on how things feel. Dont worry about whether you will come or not. Its more about investigating different sensations your body can produce.
Make sure your turned on before going between your legs or arse. So stroke your skin, play with your nipples, the inside of your thighs.
There are also a ton of secondary erogenous zones all over your body (its worth googling a list as there a quite a few) that are in unusual places like the side of your neck and behind your ears, behind your knees, the small of the back, around the belly button. Stroke, Draw small circles or patterns, squeeze, maybe try a bit of gentle scratching. Whatever feels good.
Thinking sexy thoughts helps too. Fantasies, sexy memories, whatever works for you.
Take slow deep breaths and try to relax into the sensations.
Once your nicely turned on work your way around slowly down there. I find using some lube makes this much easier.
On a cis female the whole of the pubic mound and folds of the vula are sensitive. This includes the labia. I often like to start by massaging the surrounding area before working inward toward things like my clit and labia.
(Obviously, your anatomy is unique to you, but it might be worth reading some masturbation guides for cis male and female anatomy just to get some ideas of things to try out)
Try different things.
Try rubbing different places, you may find some areas are more sensitive than others. (For me, the left side of my clit and the top of my left labia is more sensitive than my right).
When i was learning I have tried a load different stoking patterns to see what worked for me, circles, side to side, rubbing it up and down, tapping it. You can even jerk off a clit like you would a penis (this may appeal to you psychologically so its a good one to try). It is also possible to pull back the surrounding skin gently to get better access.
If yours is large enough rolling it between your fingers might be worth a try too.
Ok, i have no idea how useful any of this will be for you. But thought it might hopefully give you a few ideas to start with.
Don’t be afraid to experiment and just go with what feels good.
(Oh, there is also a nice sex toy blog by kelvin sparks that may appeal to you. He is trans male and a really good writer. I often read it and its alot of fun)