I would highly suggest to take a look at this
there are many tutorials available to make it do what you want
You can also check this category out
And just so you know, there is a search button that you can use to search anything relating to what you are trying to do.
To answer some of your questions though.
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Android tablet for waitress is possible. Using RDP connection, refer to link below
Step by step on how to Configure multiple concurrent RDP clients to run SambaPOS (IPHONE ,IPAD, Galaxy tablet) - #32 by ordinary_person -
You can split print to bar and kitchen.
Printing Tutorial in Detail
This link will give you more information regarding printing and how to set it up the way you want. -
for Inventory control(stock control and consumption control)
Inventory Control for Menu Items via Order Tags and Portion Mapping
this could be a starting point to help and understand what you can do.
If you run into any issues regarding any setup, or have questions relating to anything,
try to use the search feature in the forum, if you see that you cannot find a clear enough answer , make a new post and make sure you use screenshots and as much detail to help us help you set your system up just the way you want.
NOTE: We will not do the whole work for you(We are also users like you are), the beauty of samba is to learn how to use the program inside out, and if you get stuck somewhere and have made attempts, we will try bring you on the right path.
Good luck :D, and hope that information has been helpful.