I am struggling to work out the cases of this sentence and wondered if anyone could help.

[В следующем месяце] - I assume месяце is in the prepositional due to В and this causes the adjective "next" to form the female prepositional.

[мы собираемся навестить] - We are going or planning? to visit...

[своих друзей] - Now if the above is correct this is where I am struggling as своих and друзей are both the genitive and accusative and as far as своих goes I "think" it could work as both? Is it possible to access which one it is or should I just leave it up to my imagination.

Cheers