theBastard wrote:why? just enlarge the small one and do edits if something will not fit...
No no no, you can't do that. You can't enlarge bitmap graphics, it will result in loss of quality and artifacts. This is exactly why you should do the large map first: You can always resize down from large, but you can't resize up from small.
If i go for the large map first I'll have to remake the map again.
Well, do you have any other options? You'll have to make the large map eventually. It's better to do it now, then work on the large map until everyone is satisfied with it, then shrink it down to small and do the necessary edits and touch-ups. Trust me, it's much easier that way: the alternative would be working on the small map now, then having to do the large map later from scratch and trying to remember exactly how you did everything and repeating it in larger scale...
Don't feel discouraged. Mapmaking is hard work, but it will all pay off in the end.