1) Currently there isn't but it is a feature I see requested quite a bit, so hopefully it will be added at some point.

2) The botanist guild is located in Gridania, which, if your profile is correct, is the town you started in as Archer. It is in the northwest part of Old Gridania, I believe the name on the map will either be Greatloam Growery or Botanist's Guild. The Miner's Guild is in Ul'dah, and you might want to do your story quests until level 15 and you get your Airship pass before unlocking that so it is easier to get around.

You likely can't see Ul'dah on your map since you haven't been there yet, but I believe you can look at the Region map button on the map menu to see how the zones are connected so you can see how to get there. Still, I recommend getting the airship pass instead.

As Orophin mentioned, you have to do your level 10 class quest before you are able to unlock more classes.

3) I wouldn't waste money on any strategy guides. You can find information for the game all over the internet. I believe this website here has some good newbie information.

Hope this helps.