When world building make sure things link up and make sense working the world. Give reasons, history and events surrounding things like packs, their chosen area to reside in etc. Relationships within the pack )if you go for packs) and dynamics like how they’re lead, why the hierarchy is the way it is etc. Do they interact with humans and if so do humans know about them? Are there other beings in the world?
Are your wolves exceptionally gifted at something? If so are they all the same or only some of them gifted, why?
Celebrations, holidays etc. Do they celebrate normal human traditions or do they have their own?
If you want to write a sequel I would suggest planting seeds in sub plots through your book and let them grow through the story. Once you really get into writing it however I’m sure ideas for a sequel.will.come easily, especially if you have a bit of world building done. Readers pick up on some really subtle things so if you hint at another couple potentially being a thing or end the book with a plot that could grow immediately into a new bool then go for it! I would say to jusr fpcus on bool 1 before even thinking about a second one.
Above all else don’t let yourself get bogged down with all the days a of your world and don’t forget to write