Iamlearning, good news! You already are a Christian. That you see your deep need for God and want to follow him is the sign.
What you're really asking is, "What Now?"
The first step becomes much easier for ex-Catholics than most of the rest of the world, because one of the things Catholics are taught at an early age are the Ten Commandments. (You'll be interested in knowing the Catholic Ten Commandments are different than the real Ten, because they missed one intentionally. They miss the "don't make graven images" one specially so their people will pray to dead people. But, just the same what we learned as the Ten helps us when we come to the Lord.) Repent! Not penance. Repent. That means acknowledge all of your sins to the Lord, ask him to forgive you, and then ask him to help you turn from all of them. That's what repent means.
I did this using my knowledge from Catholic school and applying it in a new way. Instead of going to a priest to list my sins, I prayed to God and told him all the ones I remembered. (I was almost 16 at the time, so it took quite some time. You're older, so expect "quite some time." lol) When I had finished, (and the poor missionary stood quietly next to me, so his legs must have been tired by then), for the first time ever, I felt clean. Like God really did forgive me, minus 3 Our Fathers, 3 Hail Marys and 1 Glory be. He really really forgave me, and put all those sins onto Jesus' shoulders at that cross.
So, that's step one. You can do that now.
Step 2 is learning the Bible, because learning what that says tells you who God is and what he wants. (And I don't mean memorizing it. I mean finally opening it up and reading it.) Ask God to help you see what he wants you to see in it.
BUT, you're new to what God will have you see. (What you were taught as a Catholic isn't the real word most of the time.) So, grab paper and pencil, (or a keypad and screen, or a tablet, but I don't know tablets, so don't know what you need if you use that lol), and start with the Gospel of John. It is The Gospel. As in, it will teach you what you need to know most about God first. And as you read it, whenever you have a question -- something you don't understand -- write it down. And keep doing that while reading it. And keep doing that until you're finished reading the Gospel of John.
No idea how long your question list will be when you're done. Might be just a couple of questions or it might be a ton of questions. Either way, there is a next step.
Find the list of churches in your area. (Jehovah Witnesses and Mormans are not churches. They are cults.) Start with the first church at the top of that list, (or start with the one closest to your home) and call. Ask if someone will answer your questions. All of them. If they won't, then thank them for their time, hang up, and call the next one. And keep calling until you find someone willing to take the time to answer all your questions.
When you find that church, you found HOME. Go and get the answers to your questions. And then join it, because that is a real church that can help you learn more and more about God.
And, if you get frustrated, because frankly, most churches won't take the time to answer your questions, feel free to PM me and I'll tell you some denominations more likely to answer your questions. BUT, keep at it, and you probably don't need to ask me.
God will have himself a people who will love and worship him forever. And some of those people are right around you to join.
Welcome to the family. You already are a Christian.