Check for the yellow slayer master symbol on the map or minimap. It looks like a skull - at least, that's what it looks like to me. On the World Map, you can activate the list of keys with the question mark in the lower left; select the category "Slayer Masters" to make them stand out on the map. However, some slayer masters are underground; better look up an article - for example, on runescape.wikia.com - about "Slayer Master", to get more details about the locations.
If you drop the map pieces, you will need to obtain them the exact same way you did before, the hard way.
You can either pay the goblin in port sarim 10k or you can mage him and telekinetic grab the map piece. I recommend the tele-grab although it requires level 33 magic.
Play team slayer and get it as a map choice.
Use the Runescape Homepage's "Knowledge Base Search Engine" or look at the in-game World Map.
Go east from the town and find a road which runs straight down from the bridge. The slayer trainer is at the bottom of this road.
There are a number of ways to get a Whip in Runescape. The first is to buy it from the Grand Exchange, price is currently 1M. Second is to get it as a drop from another player in PvP, or buy it from someone. Third is to achieve 85 slayer, once you have this go to the slayer tower in the Canifis(check runescape world map for directions) They aren't that rare of a drop, although you definitely wont get one every kill. It could take 100-1000 kills to get one, its all chance.
You can find these Hell Rats in the sewers in Varrock, You can find Varrock by exploring your map, have fun.
you can find them on the north side of river elid at the hunter ground there look on the map
but they dont say anthing about worm brain or the map piece they just keep fighting
You can find blurite ore in the cave on the peninsula south of Port Sarim. Look for the ! on the map.
The altar locations are located by a "rune" icon on the world map. You can also find specific altar locations by Googling "Runescape Altar Map".
He is located in Varrock, in the rune shop, just below the East bank. The world map on Runescape may also be of help.