Write somhere your Warcraft idea in case you forget about it until you become proficient coder.Try something you think is possible for yourself as you know better your skills.Making simple game not making you simple.Everyone need to start from somhere.RTS and RPG and specially MMORPG are complicated, a lot!And you`ll need a team for doing one.You can do it yourself but it may take 10 years to finish it.Making all the media, sounds, objects, coding, testing...
Try making TicTacToe, Pong game,Tetris game, Alien Invaders.Something like this.
About organizing your game.You can start from the pen and the note.
After you pick a game you want to make, divide your game by stages.
Imagine the content of the game menu in details.Write down what menu leeds to what, it`s functions and so on.Later you can bother with how it`ll look where it`ll be positioned, media used and so on.I suggest you following one line of desing and do not changing it too drasticly.Then start making it piece by piece.
In Stage of Main game you need to check few things.
Who`ll be the main character.He may be a ninja, a robot, or else.
What kind of properties he`ll need.He`ll have health and mana or health only?Maybe health is not needed but he`ll have few Lives instead.Check which combination you need.The arsenal of the character?Guns, knives, slaps, bombs?Powerups.Does your game need them?What kind they can be?Health boosters, live givers, invulnerability ones,BFG`s(Big F* Guns).
What kind of enemies he`ll need to face?Count them all.The small alien from space, his cousin and their big unckle?
Does he have allies?
World?Where the action take place?
Do you need levels?If you do you can make one testing level, but do not bother with this for now.When you are at certain point start designing of real ones.Be sure to make the first few of them not too hard, next few more complicated, and the last few hard as hell.Do you think about bonus stages?
What chalenges you`ll give the player?Brake the record?Beat the clock?Kill them all?Find all the hidden gold chests?
What rewards you can give him?New weapons?The mentioned boosters?Or it can be concept art unlock?
Do not forget that you need to bound the player tightly giving him the ilusion that there is a choice.If he hit boundaries everywhere or if he have full control he`ll get bored fast.That`s why modern games suport cheat codes in practice mode only.
How will the story end?Is it neverending adventure?Happy end?
Something like this.I hope i gave you some base to start.That`s the way i imagine the things.
Where there is a will, there is a way.
I often edit my posts, that`s who i am
