I'd suggest you start by visiting several Bible believing churches in your area.
Find a church which is growing and where most adults carry Bible to the service.
After you have visited several don't consider joining the one you like and makes you feel good, consider the one which makes you think, where the sermons make you want to grab a Bible and dig into it. Where you've been asked to join a small group.
I visited several different Bible believing churches for more than year before I decided on one.
I wasn't raised as a Christian either.
Here are a list of what I call the good denominations, where I would suggest you start.
http://www.nae.net/membership/current-members
Keep in mind many of the best churches have no denominational affiliation.
Once you find a church, and I would expect you should look and visit many churches for several months BEFORE you make a decision, then talk to the Pastor about the, "How to Join?" question.
Some of the better growing churches will regularly have membership classes. Sign up and go.
Make sure the church you plan to join regularly asks if people want to become a Christian and want to start following Jesus.
If you are not sure if you are a Christian yet, see the links below:
http://www.godlovestheworld.com/
http://www.wayofthemaster.com/
http://www.allaboutgod.com/
Take an Alpha Class if you can. Churches which offer Alpha Classes are usually good.
http://www.alphausa.org/
There are lots of bad churches you need to avoid, these questions will help you avoid them:
Avoid churches which deny the Trinity.
Avoid churches which don't believe Jesus is God.
Jesus is fully God and fully human at the same time.
Make sure they agree with the Nicene Creed.
Avoid churches which baptize infants and small children.
Avoid churches with statues inside.
Avoid churches with crosses where Jesus is still on the cross.
Jesus is no longer on the cross, He has Risen!
Here is link which describes the major false cults which you should avoid:
http://www.allaboutcults.org/
This link is one of the best on the Internet giving correct and factual information about the God, Jesus and the Bible.
http://www.allaboutgod.com/