Hi Lou! Please take a few minutes to read the "Trade Skills Sticky" post at the top of this forum.
http://wow.allakhazam.com/forum.html?forum=69;mid=1131559767260411772;page=1;howmany=50#1131559767260411772
To get cooking past 150, you'll need to purchase the Expert Cook Book.
Link: http://wow.allakhazam.com/db/item.html?witem=16072
Vendor depends on your faction.
To get fishing past 150, you'll need to purchase Expert Fishing - The Bass and You book.
Link: http://wow.allakhazam.com/db/item.html?witem=16083
You'll need to travel to Booty Bay to find the vendor.
Both books may be sold in the AH, so you could check there if you didn't want to travel to buy it for yourself. You'll pay extra but some consider it worth the cost in time saved.
Edited, Jul 31st 2006 at 3:12pm EDT by thermalnoise