Easy experience and GP
When playing an advanced Knight, in Ab'Dendriel, there is a small castle called Elven Bane. It is northwest of the Elven Fortress. In ElvenBane's basements, you will find good monsters to level on and some armor called "Chain Armor", which you can sell to the the NPC in Ab'Dendriel for 70 GP. When you level to 20, you should be able to fight most of the monsters in the entire castle. You should at least be level10 and have the following equipment for your character to survive:

Soldier Helmet
Scale Armor
2 Handed sword
Brass Legs

Level Eight
Don't train in rook. Come instead to the main area then get the key in the harbor. Then train in the troll cave under the graveyard in Carlin. If they touch your monsters, kill them

Leveling, and gaining gold and skills
Mages: Rune making while leveling at northwest rot worm cave, Hell-Gate using summons, party hunt on GS and Draggy's. Note: For mages, train Magic to 50+ and level to 42+ and wait until you can go for Armageddon questing (after its update)

Knights: Train until 75/75 skills (Eq: Knight set, Bright Sword/Fire Axe/Skull Staff, 5 bps of uh). Hunting area: Poh, Mino kingdom, Kaz Dwarf Mines, Edron, Darashia.

Paladins: Train skills up to 78/62+ (Eq: X-bow, 500 Bolts, 2 bp of uh, Crown Set, and Boots Of Haste). Most recommended area to level up: Poh (with at least 400 bolts). Party Hunts: Poh: Knights block, while Paladin and Mages attack, Demon-Knights block, two Mages stand by to heal, three Mages SD, two paladins SD and shoot Bolts

Recommended hunting location
A great place for Lv 8s in main to hunt are the troll caves in Ab'Dendriel. Find the cave entrance in the center of town and go down two floors, then proceed north. You will see a door. If the door is locked, go to the cave to the left and find an elf named Shrith. Say "Ashari" then "Key" to him. Buy the key from him for 50 gold. Go back to the door and use the key on it. Go north. Then, use the key on the other door if needed. Proceed up and explore. Note: Do not be afraid to go down the ladders in the center; the only thing in this cave is trolls, and lots of them

To Gain skills...(PVP)
The best way to gain skills on tibia for a knight atleast. Get a training partner about 15+/- your current skills go half/half, no rats, and just be willing to sit for a long long time.

Equipment:
Weapon: Knife, Dagger, club, etc..
Wooden Shield
No helm unless they are 10+ skills from you or your taking so much damage it is not even funny.
No Armor, No Legs, No necklace