Okay, I Am going to hitch-hike off my my Mom's post. I'll try and focus on the combat skills and the overall free play part of the game.
Combat - Playing the normal MMORPG's you are forced into picking a class, of which can go from the simple versions of Warrior, Archer, Mage and the occasional Gun-slinger. This game however, gives something that amazes me, even to this day. It's the fact that you are not forced into doing anything! You can be a Warrior-Chef-Healing...Singer? Or what i'm doing right now with my character, which is a Mage-Warrior-Support-Fisherman. Yes, Fisherman. There are so many things in this game, It would take me a good 4-5 hours to type it all out for y'all. But ill give you the basics here.
Warrior Skills are based off of your Strength stat, Which boosts your power and the amount of damage you will cause.
These are the Melee skills, (Note: There is no limit to what skills you can and can't have, you can literally be a Epic-Skiller.)
Assault Slash
Charge
Counterattack
Defense
Evasion
Final Hit (Final Shot if your a elf)
Lance Charge (Elves Can't use Lances)
Lance Counter
Smash
Stomp (Giant Only)
Taunt (Giant Only)
Wind guard (Giant Only)
Windmill (Not Giant Only)
Then of course you have your mastery skills (I don't think i have to tell you those, its pretty basic, But i'll list them)
Warrior Mastery's
Axe Mastery
Blunt Mastery
Lance Mastery
Sword Mastery
And since it does (sorta) count as Warrior skills, i'll list the ranged skills also.
Arrow Revolver (Human Only, Gives humans a fair shot at living with elves and giants)
Crash shot
Elven Magic Missile (Elf Only)
Final Shot (Explained during Melee skills, This is the elf version, Which is so cool...)
Magnum Shot (Ow, It hurts a lot)
Mirage Missile (Elf Only)
Spider Shot
Support Shot
Then of course, there is Bow Mastery
Now we jump into my domain of this game, I said earlier that I'm a Mage, so lets jump into the good stuff (mwuahaha)
Magic skills are mostly made for support, with a few exceptions. The Mage can go either path of being a Support, or a Power house. (Like i also said earlier, you can do anything, It's easier for the both of us, if i explain it this way.)
Power house Skills
Blaze
Firebolt
Icebolt
Lightning bolt
Fusion Bolt
Snap Cast
Spell Walk
Thunder
Fireball
Ice Spear
Meteor Strike (It's just as amazingly scary as it sounds)
Hailstorm
Mana Shield
Shock Wave
That is the list of the -I'm evil, lets blow stuff up- skills.
Here is the list of -Oh look, there's a bunny, lets heal it!- skills
Healing
Party healing
Meditation
Lightning Shield
Ice Shield
Fire Shield
Enchant
Natural Shield
There are the support (cleric) skills
Then there are the element mastery's and the overall magic mastery
Now, there are three other skill sets that you can pick from, My Mom explained one of them, which was the Life skill sets. I'll have to ask my brother for the Alchemy and fighter skills, because I'm focused on neither of them within the game. (And i don't want too mess up important details, Since they are quite special)
There you go with the basic skills of Warrior and Mage.
Now lets get into the Game details (Without any spoilers, hopefully)
You are set within 3 continent's (Uladh, Iria and Belvast) Humans come from Uladh.

Elves and Giants come from Iria.
Within Uladh, the towns/cities are Tir, Dunbarton, Logging Camp, Bangor, Emain, Taillteann and Tara.
Tir, is where you will start if you create a Human character.
Within Iria, the towns/cities are Qilla Base Camp, Filia, Cor Village, Vales and Renes.
Filia, is where you will start if you create a Elf character.
Vales, is where you will start if you create a Giant character.
All of these places you can visit, doesn't matter what race you are, you can always visit it. (Just watch our for the creatures that will kill you, if you poke them with a stick... - Personal Experience-)
Well, I'm going to wrap this up for now, i hope this helps a little bit. If you want to know more, post a question, and ill try to answer it.