Hi Sirish, how are you doing? Please find the replies (to your questions) below:
1. To create a thread, simply go to a sub-forum (like 'The Tourer' or 'Help Me', for example) and click at the button on the top left of the page which says "New Thread". It's as simple as that!
2. xBhp does not allow any sort of advertisements regarding any other forum (or automobile related ads); this sort of ad is considered as 'spam' and instantly deleted and the concerned member either banned permanently or for a substantial period of time.
3. G2G simply means Get2Gether; it's a weekly gathering of xBhpians on any pre-decided spot (generally on weekend [Sundays]), where we meet, greet each other and basically chill out.
Hope your queries were answered successfully.

If you have any other query, please feel free to revert back.
Regards,
-Aryan.