Ok first things first is there a limit to eggs?

There is no limits on eggs.

1,You get it after you beat the elite four if choose Charmander as your starter, he will be in Kanto some wheres.

2,That is where you can catch Unowns.

3,Nothing dude, nothing special.

when you breed two compatible poke, you might get two eggs. literelly this is 4 questions.
1.pick charmender as your starter an dafter you beat the elite 4 and got the national dex, the legendary beast will start roaming around in KANTO!! Not the sevii islands, KANTO

2.you need to solve the puzzle in island 7, the cave there before the house. Then the tombs will open and it will let catch the unknowns.

3.Well to really finich the game you need to complete this stuff.

Beat the Elite 4 million times.
Put every Pokemon in the hall of fame
Level all your Pokemon to 100
Complete the national dex
Breed millions of egg.

So you have a long way to go little one.

1) No, you can have as many eggs as you want.
2) If you started with Charmander, Suicune will run around Kanto after you defeat the Elite 4. If you didn't start with Charmander, it will be Raikou or Entei.
3) Do you mean the chambers on 7 Island. After solving the Tanoby Key in the canyon, Unown will appear in the ruins.
4) You wait for the sequel just like every other Pokemon game.

There is no limit to eggs.
1.If you picked Charmander in the beggining,Suicune will run around in the wild after you get the National Dex.
2.That's where you catch Unknowns.
3.Well,if you catch all the Pokemon,you get a diploma ( which you don't get to keep ).There is really no way to 'beat' Pokemon unless you have all the Pokemon on level one hundred.Even after you do that,nothing happens.