If so what should I start with? I really have no idea about Christianity other than the Bible.

Getting baptized is generally the first step in becoming a christian :p

Given that most posts in this community have been memes, I'm pretty sure most of the Threadiverse is likely non-religious (myself included). As long as people aren't actively proselytizing their beliefs across random communities, however, I think a community like this is exactly the sort of niche topic that people may be missing from Reddit, versus the standard fare of news and politics.

Assuming you're being serious, for most Christians a major component of their religious practice is the church they belong to. While different denominations interpret the Bible in different ways, from a practical standpoint I would suggest seeing what churches are near you, consult their websites to verify that their beliefs to not conflict with yours, and participate to the extent that you wish to.