Learn to love halls of agony until 144 then naga gp until 170ish then bug cave until 192ish.
Pro tip, you do NOT have to leave GP caves that cost demon souls on entry. You can log off and back in without paying the initial souls cost. Just find a safe spot to log off and in.
I did levels 154 to 172 in 3 days on my wiz in naga gp without leaving the cave once.
Also while in naga GP, hit the crocks. It's rare but they can drop gold bars that give 10 mil gold. Don't bother picking up the gold bullion things they just clog your bag.
Don't bother using sc/mc/dc crystals or runes until you have Ely kit. Don't waste time on cele kit unless it's stupid cheap cause Ely gear is cheaper in most cases now. Especially armour.
Pick up every lichen you see and dump in the AH for 150k. People buy them all day long.
Don't waste gg on books, farm them on double super double champ days. Yes bosses drop them but supers and champs do more often.
And the best tip I can give you, get a leveling buddy. Until 195 you will level drastically faster with someone else as long as they aren't slowing you down. Depending on your class find someone who plays a different class than you. If you're a wiz find a warrior with luring cry. It's the best skill in the game for leveling.