Is there a site that tells you what skills you can advance with a token, how much they advance or any other questions i might have about them?

Yes there is!

This page on UO.com: http://support.uo.com/advancedcharacter.html

It lists all the different Advanced Character Templates that you can get. You have to choose a template and you can't just advance individual skills unfortunatly. So it's best to choose the one that will works best for you.

Thnx for the link. I was hoping they had something for advanced fisherman. Oh well, cant have everything i guess.

Hey, would it be best to have fishing on a thunter or something else?

Hmm...it's really up to you.
Fishing is one of those nice skills that doesn't need any other secondary skill. If you have room on a T-hunter, I think it would fit nicely on that character.

I have my fishing on a thief! Makes no sense, I know...that's just where I started working it. hehe

Since the advance characters have to pretty much be skillless and statless (think less than 200 skill points total) prior to being 'advanced', maybe make the new char with 50 fishing and 50 healing or whatever skills you might need in addition to the advanced ones. Pretty sure you can set that up when creating the new char by choosing the advance option instead of one of template options.
Anyway, good luck

I have fishing on my thunter.

Magery
med
eval
fishing
lockpicking
carto

I to have fishing on m t-hunter. I pretty much kept my t-hunter like the advance character and added Medation and Fishing. And with soulstone I can remove or add skills depending on the situation. I figured to keep peacing and maybe put provoke on in the event i try to do lvl 6 maps solo. If you do choose to use the token just put 50 into the two skills you want ot make it a 7 skill character and then go form there when you make new character.

Great advice Niles, think i will go that route.