So I just had a bit of a panic and realised that the app name I want may not be available. Just went ahead and created an app in iTunes Connect using the bundle id, sigh of relief, it is available.
I am about a week or two away from finishing. Filled out Description and uploaded one screenshot.
How long do I have to finish these details before it is deleted?
Do I need to enter any more details or click on submit for review yet?