First time arduino attempt. 4 switch inputs controlling 8 LED outputs This is my first venture into Arduino. I am unsure which one to use even for this. As this will be a dedicated unit, and size is a small priority, the smaller the better.

Here is more info on the scheme I am looking for.

Switch 1 on turns on LED groups 1 and 2 

Switch 2 on turns on LED groups 3, 4, 5, 6, 7 and 8 

Switch 3 on turns on 1 for say 500 ms, then turns 1 off, turns on 3 for 500 ms, then turns off 3, then turns on 5 for 500 ms, then turns off 5, turns on 7 for 500 ms, then turns off 7, then loops back and turns on 1 repeating the cycle. 

Switch 4 on turns on 2 for say 500 ms, then turns 2 off, turns on 4 for 500 ms, then turns off 4, then turns on 6 for 500 ms, then turns off 6, turns on 8 for 500 ms, then turns off 8, then loops back and turns on 2 repeating the cycle.

Will I need an Arduino uno, nano or micro? 
I am hoping this will be an easy to do project in order to learn the world of Arduino
Micheal well easy solution is to use arduino nano as its bread board friendly and easy as it comes with the arduino IDE installed, well if size is what you are looking for then digispark attiny 85 can also do the task and its size is almost equal to a coin but for that youll need to install it in the arduino IDE which is a bit difficult.
if you need any help with attiny 85 you can come here