First and foremost, you need to know that doctrine is way less important than being spiritually alive. Most of the debates about predestination, eschatology, the rapture, millennialism and such are pointless and often divisive. It's good to know the Book of the Lord. It is far more important to know the Lord of the Book. I teach the Bible, so I am still a student myself.
I call myself non-denominational for a reason. Over nearly 50 years, I have found very little real differences in doctrine of protestant denominations. I've found even less interest from church attenders about the doctrines that differentiate denominations. I am also convinced that God does not have a theology exam in order to ascertain position in God's kingdom. God looks for fruit, not doctrinal perfection.
My advice is to ask God for the Spirit of Wisdom and Revelation. Read the Bible with an open mind and a receptive heart. Ask God to show you what a passage means, not just what it says. Keep a notebook handy and write down anything that is a revelation.
How do you know it is revelation? It is not easy to describe, but you will know. You can read the same passage many times and not realise what it is saying. I remember the time when I read that I should treat my job as if I was working for God (Colossians 3:23). It made a big difference how I approached work. I'd read that verse before but it had no impact. Then the light came on - revelation.