"Fist of Guthix Tokens" or just "Tokens" can be obtained from the Fist of Guthix minigame. To get to it, you need to leave varrok by the north entrance, and continue north into the Wilderness for a short distance, arriving at a cave entrance marked on the minimap by a red quest sign.
I assume you mean the Fist of Guthix tokens. Simply continue playing, until you have the 600 tokens.
Kill Gremlens
you get it from dungeoneering for 34k or 44k tokens
fist of guthix if you have enough tokens
one
there are no black gloves in runescape but u can get black gauntlets buy them at the first of guthix for about 100 tokens or get them at grand exchange and charge then at first of guthix for around 25 tokens
Rewards, at the Reward trader south of Daemoneim.
You have to talk to the guy who sells them and then he will recharge it for you but it will cost tokens.
You can only get dungeoneering tokens by getting experience in dungeoneering - that is, by completing dungeons, alone, or in teams of up to 5 people.
Playing mini-games around the warriors guild, try talking to NPC's.
Swordfish gloves are a reward that can be purchased with 200 tokens from the Fist of Guthix minigame.
The best longsword, according to the runescape wikia, is the chaotic longsword. The chaotic longsword is obtained via the dungeoneering activity. It costs 200,000 tokens and if completely uncharged will cost 2 million coins or 200,000 coins and 20,000 tokens to recharge to 100%.