If God has placed a strong, unquenchable desire in your heart to enter into ministry, then there is a good chance He is calling you into the ministry.
I was called into ministry in 2009, however because I wasn't educated enough, I knew that it wasn't time for me to actually begin preaching, so I guess you could say that I discerned the call to preach as a call to prepare, which it is. Not only did my knowledge and skills have to be prepared, but so did my heart and my life. I studied the Word of God very intensely for two years. I also studied the teachings of ministers in my faith group. It took me two years to feel fully prepared, but now I do feel prepared and I am a youth pastor. On down the road, I can see myself serving as a senior pastor, but God is still growing me and training me in the ministry.
Not every case is the same, so I encourage you to be led by the Holy Spirit, and don't make a hasty decision. Pray hard, but the greatest advice I can give is this: do not begin preaching unless you have a clean heart, because without that, you will just fall.
If you do feel that God is calling you into the ministry, here is some suggestions I would like to give to you:
1. Above all, pray
2. Study your heart out, because when you get in the ministry, you won't have as much time to study.
3. Talk to your pastor and see if he/she will help you to begin your ministry.
4. Seek the mentorship of more experienced ministers. (at least one minister)
5. Listen to / watch ministers of sound doctrine to learn more about preaching.
6. Study a few public speaking skills, because you will need them in order to be a good communicator. These skills will make you more confident when you deliver a sermon.
That's six tips that come to me right off my head. I hope they helped. If there is anything further I can do to help you, let me know. I would be glad to help!