Design it in as big a res. as your pc can handle. Then you can always scale it down to suit the media you want to display it on.
if you are using vector designing, try making it as big as possible without confusing yourself.
if you are using bitmaps with vector, you can either 1: Vectorize the bitmap with your hand, or 2: lose the resolution.
Goodluck!
yes, as big as possible, it will be more versatile later on. say you'll need it for a billboard??? lol...
Like everyone else said, make the image as big as possible.
If you design the logo in a small canvas, there will come a time when you need a really big version of your logo. If you try to make the original size of the logo bigger, it will decrease the quality drastically unless it is a full TRUE vector image.
So when you make it in a large canvas, save that as the original copy, and then save another as to how big you need it.
Hope this helps.