Robotic Hand - Best arduino model to use? Button presets for hand positions?

I am trying to create a robotic hand that has several buttons for different grips and hand positions.

The way I want it to work is when you push a button the hand moves into that desired position or grip. i.e. Press Button 1 - 1 Finger Point, Press Button 2 - 2 Finger Point, Press button 3 - Thumbs Up

I am unsure which arduino to buy, the coding needed and the additional parts to set up such a system.

I am basing my design on the 'Dextus Hand' as featured on

I am new to the whole programming world and need some assistance. Any help or redirection would be appreciated.

Thank you.

Previous post that might have info.