In short...Any way he chooses... just be sure you're being led of God, not flesh.
As for the question "How can God use me?"... This same question can and should be asked by every believer, male or female. And like most stuff about God, to find the true answer, we need to seek his face until he makes it clear to us. And yes, his answers will always align with his word (gotta say that or someone might suggest I've gone off on a tangent).
BTW, I once struggled deeply with some spiritual stuff which practically debilitated me for about 18 months. Finally, I received enough strength from God to receive deliverance one weekend in church. YES!! I was finally ready to go to work and show them what was possible... But when I returned to work on Monday, I was informed that I had been given a supervisor... in a department I myself had created for the company. I was shocked... I said to God in my heart "Now??!! ... I had expected to be fired any day up until now but why would you give me a supervisor on the first day I'm finally delivered? I want to be a leader and a teacher, not UNDER people. This seems like I'm going down, not up." God answered me right away, saying "Teach them how to serve."
So I set my face to be the best servant ever.
My boss, however, did not seem to have "Being the best supervisor" as a priority, so I had a lot to learn to deal with. Skipping the details, I'll simply say I learned that proper submission is JUST as powerful as having the authority yourself. In fact, a submissive person can wield more power and ability than those who are in authority over them...and an unjust ruler will FEAR the righteous servant. (Consider David and Saul in 1 Samuel 17-end of book) I learned this by experience rather than just quoting a passage.
Authority = responsibility = Obligation. Having a position of authority in a church (such as being a preacher) means that the person is OBLIGATED to feed them what they need, when they need it. And that person will have to give account of every soul put under them. That's why we need to pray for those in authority...because that can be a daunting thought.
However, there is nothing stopping you from seeking God's face until he gives you something to feed another. And you may give it without day-to-day obligation... Just do it outside of the preacher's domain (the church service) unless the pastor specifically allows for this, or God
specifically tells you to give it during church. (You'll be learning how to try the spirits, etc. during this process).
Here's a scripture supporting this kind of service to the body of Christ...and note that it is directed to a woman:
Song of Solomon_1:8 If thou know not, O thou fairest among women, go thy way forth by the footsteps of the flock, and feed thy kids beside the shepherds' tents.
I hope this finds you well.
Love in Jesus,
Kelby