Be aware there it is VERY likely there will be no flash 10.1 for n900

So if you want mobile internet to access flash content on the web, avoid the N900 and go for something like a droid phone instead where flash is confirmed (at least for the future).

But if it is for normal webbrowsing (i.e. flash is optional for you) then the n900 is a decent choice.

Just be aware there is very little official support from Nokia - support is in the form of VOLUNTEER help from the forums - so be prepared to search through pages of forum posts to find answers (there are answers for most things).

I emphasize these things because from your questions you dont seem to be very computer literate (no insult intended) so I am not sure whether the n900, which is a hacker/coder's paradise, is suited for you.