Hello Chris (@Chris21), first off, since I see that you are brand new around these parts, welcome to CChat More importantly, since I also see that you are a new believer, welcome to the family of God, as well
As far as where to begin posting here, if your questions or thoughts concern theology, doctrine, or the Bible itself, the Bible Discussion Forum is your best bet. And if you do not have a matter that you want to discuss yet, you will want to look for an existing thread that interests you and join in the discussions that way (by replying to it with your thoughts, particularly in regard to the topic that was laid out for us in the OP).
God bless you!!
~Deut
p.s. - your thread title "LOST" has to do with where to begin posting threads, or replying to ones that already exist, yes?
1 Thessalonians 5
23 May the God of peace Himself sanctify you entirely; and may your spirit and soul and body
be preserved complete, without blame at the coming of our Lord Jesus Christ.
24 Faithful is He who calls you, and He also will bring it to pass.