last I checked you need to go through the greenlight process -- I think the greenlight process may be going away or may go away in the future, not sure, but the way I got in is I went through greenlight.
so you put your game listing on and steam users will vote if they like it or not based on the information and video and images you provide. if enough vote that they like it you get to list on the store, at which point they supply the documentation and stuff and it's, at least for the most part, not that hard to follow.
Oh my, this game awesome!! XDD
1 word. perfect!!! XDD
where's i can play for ful version??
thank you

you can't yet, it's not done!
Glad to see the game coming on so well. Came across some beta videos people have been putting onto youtube the other day too!
Doesn't seem 2 minutes ago since we were in the chat room talking about you starting this game!
Shall be purchasing once complete 
thanks!
seems a lot longer than 2 min to me.

and the beta videos posted by other people were a bit surreal and fortunately everyone was pretty kind to it.