, Please 
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from my experience it's a bad idea to just work on one skill and think you be rich from it. that's not true. all of your skills work together and help each other
Woodcutting is a very good skill to make money. but not so much until you reach lvl 80 or so when you can cut magics fast.
Fletching is also really good and fast to level up if you work hard. I got from lvl 10 to lvl 90 in a week and you can get to lvl 99 with just a few mil and a sacred clay fletching knife (sacred clay items give you 2x the xp)
Quests also play a big role in things. the more quests you have the better. one reason being is because your trade limit is based on your quest points. and if your planning on being a merchant then you will want to have those quest points!
Merchanting is the best way to make money. but you have to be smart and it takes alot to be good at it. when I was learning I lost about 10mil before I started getting a profit. but then I got help from a friend who was a merchant.
Here's a good trick. buy dragon daggers and then buy weapon poison and use the poison on the dagger to make a Dragon Dagger P++ then go to a pvp world and sell it for 100k see your making 70k profit for every one you sell. because dds's don't really buy on ge and people in pvp worlds buy then all the time. this really works!
one thing that got ruined is tanning green dragonhode. that used to be a really good way to make money but now they don't even boy or sell.
And there's a secret way to make money that not many people know about. it's really boring tho. and it requires about 5 quests or so. yep! i'm talking about sacred oil. I won't go into full detail here (might later) but you can make up to 6mil a day if your focused.
no matter what tho. the only way to make lots of money is to be a member. because unfortunately, non members make thousands, not millions.
