Bible based Christian Churches won't let you join until AFTER you've become a Christian.
The tragedy today is that most churches no longer follow the Bible.
Even many groups which left the Roman Catholic Church 4 to 5 hundred years ago and started following the Bible, no longer do.
If you call up a church office and say something like this:
"Hello, I'd like to join your church."
The first thing most churches will ask is something like this:
"Are you a member of a church of our denomination in another location?"
And when they find out you've never been part of any church, they will usually respond in one of three ways:
A. They will invite you to take some sort of class teaching you about the distinctives of that denomination or group.
B. They will invite you to take a class such as the Alpha Course which is an introduction to the Christian Faith as described in the Bible but is not an introduction to any particular denomination of local church.
http://www.alphausa.org/
C. They will question you about what your relationship is the Lord Jesus Christ and will begin to tell how Jesus died for your sins and that by trusting in Jesus your sins can be forgiven. They might use a gospel tract such as the Four Spiritual Laws or something similar to that. Here is a link to a web site containing the Four Spiritual Laws:
http://www.godlovestheworld.com/
The church you want to start attending is the church which answers with B or C above.
There are lots of good denominations around and sad to say lots of bad ones.
Personally I would avoid any group which is a part of the National Council of Churches or which baptizes babies.
I would find an Evangelical Church. Not all Evangelical Churches are member of the National Association of Evangelicals, but most of them are and that is a good place to start.
http://www.nae.net/
Here is a list of the denominations which are members:
http://www.nae.net/index.cfm?FUSEACTION=nae.members
Denominations
Advent Christian General Conference
Assemblies of God
Baptist General Conference
Brethren in Christ Church
Christ Community Church
Christian Reformed Church in North America
Christian Union
Church of God
Church of God (Holiness)
Church of God Mountain Assembly
Church of the Nazarene
Churches of Christ In Christian Union
Congregational Holiness Church
Congregational Methodist Church
Conservative Congregational Christian Conference
Conservative Lutheran Association
Elim Fellowship
Evangelical Assembly of Presbyterian Churches
Evangelical Congregational Church
Evangelical Free Church of America
Evangelical Friends Church Eastern Region
Evangelical Lutheran Conference
Evangelical Methodist Church
Evangelical Presbyterian Church
Every Nation Churches
Fellowship of Evangelical Churches
Free Methodist Church of North America
General Association of General Baptist
Great Commission Churches
International Church of the Foursquare Gospel
International Fellowship of Christian Assemblies
International Pentecostal Church of Christ
International Pentecostal Holiness Church
Midwest Congregational Christian Fellowship
Missionary Church, Inc.
Morningstar Fellowship of Churches
Open Bible Churches
Pentecostal Church of God
Pentecostal Free Will Baptist Church Inc.
Presbyterian Church in America
Primitive Methodist Church USA
Reformed Presbyterian Church of North America
The Brethren Church
The Christian & Missionary Alliance
The Evangelical Church
The Salvation Army
The Vineyard, USA
The Wesleyan Church Corporation
Transformation Ministries
US Conference of the Mennonite Brethren Churches
United Brethren in Christ
Worldwide Church of God
This link gives a list of Organizations which are members:
http://www.nae.net/index.cfm?fuseaction=nae.members&listId=organizations
This link gives a list of Academic Institutions which are members:
http://www.nae.net/index.cfm?fuseaction=nae.members&listId=schools
And feel free to ask me questions directly if you like.