We have a lot of toys. Most of them are kept down in our finished basement. We have storage bins and each bin has one toy set in it. So, we have: Legos, Knex, Playmobil (we have 6 bins of these!), Kapla, cars, Darda race tracks, etc, etc, etc. Games are on the top shelf so that the kids need help getting them!! I hate losing pieces.
I do keep some toys upstairs for the baby - a toybox of baby type toys, a doll dresser and her tea set.
Good luck getting organized!!