#1
what are the properties and features (for the guitar) of the different kinds of woods for the fret board, like rosewood and mahogany?

thanks
#2
Fretboards are generally either rosewood, maple or ebony.

Maple is snappy, with a lot of treble. Rosewood is more mellow, and I haven't had a guitar with ebony; so I don't know about that.
#3
neck woods make only a very small difference to the guitars sound as there is very little wood to actually resonate thus little colouring of the sound. the neck on almost all guitars is maple - so having a maple fretboard allows you to have a one piece.

in terms of sound it goes maple -> rosewood -> ebony with maple being the brightest, rosewood being a middle ground and ebony being thick and heavy.

in all honesty the biggest difference it'll make to your guitar is cosmetic - it takes a very very good ear to hear the differences. the way you attack the strings etc. is far more vital so go for what looks good
The only 6 words that can make you a better guitarist:

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#4
^Nope, ebony is the brightest, then maple and lastly rosewood.

Alot of woods make good fretboard woods. The tone of the fretboard is probably none existant to be honest.