1. Decide whether you want what Jesus Christ offered - which was resurrected, eternal life after biological death, as a Son or Daughter of God, in a loving Heaven, participating in the continuing work of creation.
If you don't want this - then it is not really worth proceeding.
If you do want this:
2. Decide whether you believe Jesus really was divine, the Son of the creator of the universe - and therefore able to deliver what he had offered.
How could you know such a thing? It is unlikely that you will be convinced by any process of research, history, or logic, or the authority of living Christians.
(If you try to get an answer by some kind of investigation of external sources, the statistical probability is that you will encounter fake Christian sources - because these are in a large majority.)
So you should proceed to ask this question directly. That is, ask your-self whether you believe Jesus was and is who he claimed - you should ask this by an act of simple but profound reflection. Ask it of your deepest true self which you might agree has divine authority (because if God is good and we are his children, then our deepest self is divine and authoritative).
Ask it of God the creator; ask it of Jesus - who lives and reigns. Clear you mind and wait in silence for an answer that carries its own authority.
Ask the question simply, and the simple answer may come to you as a direct form of knowing.
If you get the answer Yes - Yes, Jesus was divine and can deliver on his promises (which you want for yourself), then...
3. Look around at the available (self-identified) Christian denominations and churches - and investigate (and question) to judge if there are any accessible that you predict will help you to be a Christian.
If you find one, try it. If the actual, local church helps, then join it - do it, as fully as possible (evaluating, all the while, to check that it really is helping).
4. If there are no satisfactory churches accessible - or none satisfactory to your needs and discernment; then just get-on with being a Christian on your own, as best you can. Don't feel guilty! Take full responsibility for your own faith - no excuses accepted!
Note: What I would say Not to do: Don't join a church and then try to change it.
Because insofar as you succeed, it will certainly weaken and probably destroy it. All worthwhile churches are pretty tough about certain things, and if you don't agree with what they are tough about - then don't join them, or leave them. To liberalise and subvert existing Christian churches is to to aid the enemy.
If you join a church and find that it is overall helpful, and that overall you approve of its aims and methods - then support and strengthen that church so that it can makes its distinctive contribution to the work of salvation and theosis.
And if/ when your chosen church becomes corrupted by secular leftist materialism - then cease to support it, leave it.