What DB exercises were you doing at the Y with the 8s? You can do any of them at home. You might want to consider investing in some other size DBs also so that you have appropriate weights for all your muscle groups.
A great site that gives little videos for just about every DB exercise ever invented is Exrx.net. Pick a muscle group and the exercises are grouped by equipement type - just go down the list till you hit Dumbbell.