By fishing. Once you have the level, fish at the Barbarian Village. More advanced fish gives you more experience per unit, but it is slower to catch each fish.
Power-fishing at Shilo Village is great for fishing experience.
The best way to fish on runescape is to use a net or a fishing rod and bait in draynor. Then it is easy to bank your fish
fly fishing is always the faster option in ruenscape even for members
That is easy. Go to Barbarian Village and catch some trouts and salmons and drop them (not cooking).
fish food and then chop logs and make a fire with tinderbox and then cook
Dragon Bones on a Gilded Altar.
Powerfishing ( Fly fishing ) at Shilo Village is quite fast since the spots near a bank and the fish obtained there will apply a fast and steady experience rate.
A nice way to advance fishing is the fishing contest (fish flingers) - only for members. If you are not a member, you'll just have to do normal fishing.
sadly no, you have the fish them all the way up in the Piscatoris Fishing Colony.
Tutorial Island no longer exsists (well, it does, but there is no way to get there).
Yes, its a really good way to make money.
The best way to get experience in RuneScape is simply to do whatever the skill you wish to raise constantly. Only through repetition will you succeed in becoming good in that skill. As you progress through the skill it will become easier to obtain the experience, but harder to gain the levels, and so again repetition is always needed. This forms the basis for levelling up in all areas of RuneScape.