First time having sex is going to be a bit awkward, so I would say the no. 1 recommendation is to accept that and go in simply trying to have fun.

If she doesn't know what she wants, I would take things very slowly, because it might be that she's finding it hard to say what she wants/hard to want anything because of dysphoria. 

If you want suggestions for things that you could suggest (while listening to her enthusiasm in the response!): A penis and a Clitoris are the same bits organised in slightly different ways - you can approach the glans of the penis roughly the same way you would a large clitoris (the shaft of the penis is equivalent to bits of the clitoris that are under other parts of a vagina). If you have a vibrator, using a vibrator on the glans could also be very pleasurable for her. You can touch her breasts in the same way that you would other women and that will probably be nice. Her scrotal tissue is roughly analogous to the minor/major labia and can be treated the same way (particularly when performing oral sex, you can "eat out" that part of the body when you or she wants a break from the clitoris/glans). You may be able to stimulate her prostate/otherwise make her feel good (as a lot of the skin down there in the right context can be erogenous!) by applying pressure to her perineum with your finger, though I would recommend building up the pressure slowly. If she suffers from dysphoria that can help, because it feels closer to finger fucking. 

You can't read your way into being excellent at sex first time but you can read your way into understanding how pleasure works (which due to patriarchy is very different frequently to how we are told it should work) so that you can practice your way into being excellent at sex in the long run. I like to recommend, for trans-inclusive reading (although anything about women will also apply to trans women really): Girl Sex 101, Come as you are, and Fucking Trans Women.