You say: "I am new to this field"... new to what field exactly? And, in what fields do you have experience?
The answer to (1) is lots of hard work... which toolkit were you thinking of using?
For (2), I need to know which toolkit you're using.
3, webmail is not actually a word, but are the two words "web" and "mail", for each of which lots of books and tutorials were written.
4, ideally everything should be server-side, all the client should have to do is render html.
Tutorials? For which toolkit? But, there are html tutorials and css tutorials, and other html-relevent ones; just search the web for each, you'll get lots of hits.
But if you want to write applications, you have to decide what toolkit you're going to try, and then go thru tutorials relevent to that toolkit.
