If I find anything else that would be extremely helpful for a beginner, I will add it. For a database of items and quests, please see this thread.

The basic currency inarchlord gold. There is a currency you can buy with real money called Chantra, where you can go into the Chantra Shop and buy items that cannot be dropped by monsters or be bought from merchants.

These controls and hotkeys are set by default. If you wish to change them, you may do so in the game menu (press ESC when logged in to the game) and select Custom Keys.

Hotkeys:
I - Open your inventory. You have 4 bags with 16 slots each, allowing you to hold 64 items total.
C - Open your character window. Here, you can see your character stats, experience, and equipment.
Q - Open your quest log. Only your active quests are displayed here.
U - Open your mailbox. You need to buy letter paper from a <Merchant> in order to send mail.
G - Open your guild window. As a regular member, you should be able to see who's currently online and what level everyone is.
K - Open your skills window. Skills are acquired through a <Trainer> according to your character's class.
J - Open your craft skills window. Craft skills are alternate skills including Ransacking, Skinning, Carving, Cooking, and Alchemy. These can be learned from an <Adventurer>, a <Cook>, and an <Alchemist>.
P - Open the party window. Here, you can invite someone to a party and change party options.
F - Open the friends window. You can add people to your friend's list and see where they are located.
M - Open the World Map. if you are in a town, the Town Map is displayed instead.
1 - Use a Health potion.
2 - Use a Mana potion.
3/4/5/6/7/8/9/0/-/= - Skill hotkeys.
Tab - Target nearest monster.
Spacebar - Automatically pick up the nearest item.
Alt - Toggles on/off item names on the ground.
R - Automatically set the chatbar to reply to the last person that whispered you.