Good luck dude. Hope its easy for you.
When you get on the ferry, make sure you still have some AZ Manat and plenty of drinking water. Water for the boat and customs in Aktau. Beer is 2 Manat for 1 liter. Meals are 2 or 3. Its cheaper then Baku.
Also, bring toilet paper. Maybe hand sanitizer.. the toilet is.. well umm amazing.