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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
This kata seems a bit harder than those that are placed in this level.
regarding the 7kyu part: kata ranks are shared across languages. so what's easy in one language may not be in another one, so the rank is fixed accordingly
no one can really give you any suggestions since you're not giving any code snippets to help on
your best bet is to unlock solutions to see others' ideas and come to your own solution