Thank you so much.

The bigger the tablet the better, I have a tablet thats really small and you can barely use it.

I disagree, what you see often with larger tablets is that the cursor becomes jumpy (depends on the brand)

A tablet is like drawing with a pencil except on the computer
Yes this is very useful to have i have a Wacom Bamboo they come in handy in tough to do situations and the more control u have over ur cursor is better than compared to a mouse so i advise you to buy one