is there a place for us to test stuff's before posting them?

That's what the "go advanced" and "preview post" buttons are for...

but what if we need to test the whole thread

As of now, there is no test forum where you can do that. :x I guess the closest thing you can do is just to mark your thread as "Closed" while you set it up. ^^;;

Rylynne is correct -- Just put "Setting Up!" or "Closed" in your thread title and people shouldn't post there. If they do, shoot me a PM and I can delete any posts for you. :yes:

Just use the preview button to see each post before you post it, then you can go back and make edits if necessary.