Well, the thinking is that the 1st thing that normally gets done after importing images is selection / rejection. i.e., make picks / rejects before doing anything with collections. After all, the rejects are just going to be deleted. So while you're in the default view, do your picks / rejects (e.g., using 'p' and 'x'), then delete all the rejects. Then you can take what you have left and organize them further to suit your needs (e.g., via collections, color labels, etc.)