Just some quick ones..

if i go to the fish market at about 10am lets say after ariving fron kyoto will it be pointless.. or still worth doing?
what time does public transport start and finish in tokyo city.. like subways and buses?
And is there a place where i can download a train.subway map of tokyo giving me direction on whre things are?
thanks :)

if i go to the fish market at about 10am lets say after ariving fron kyoto will it be pointless.. or still worth doing?

Assuming you refer to Tsukuji Market, I was there just today around 11:30, and there was still lots to see. But after noon, stores start to close.

what time does public transport start and finish in tokyo city..

Start around 5am. Stop around 1am.

And is there a place where i can download a train.subway map of tokyo giving me direction on whre things are?

Tokyo Orientation:
http://www.japan-guide.com/e/e2017.html

Also, if you enter "Tokyo subway map" and similar terms into Google, you will get lots of results:
http://www.google.com/

Fish market youll be good

5am(ish) to 1130(ish)
All night taxis

as for maps and such...search online man, go to your local tourist location they should have something...or when you arrive here just look for the maps! subway and train guides are EVERYWHERE

I was very unlucky, I went there by 9.00 to find out it was closed. not sure if it was bank holiday, closes saturday or why, just was emptied, so check the dates before you go, it was a few of us turist, arriving there an desapointed

I have been there too on a closed date in the past. Here is the opening calendar:
http://www.tsukiji-market.or.jp/etc/calendar/2008.html
red dot means closed
blue triangle means opened exceptionally
no mark means opened

Here is a really good subway map of Tokyo:
http://www.johomaps.com/as/japan/tokyo/tokyo2.html