There is no limit.
There are many Minecraft Survival Games server. The best one I think is CraftRealms(hg.craftrealms.com).
This all depends on your maps. A copy of Minecraft that has no started maps is around 228KB. But after you start playing this will go up.
Not completely, many people make Minecraft maps for fun and for personal use without charging. They may ask for donations for the hard work they put into their maps, but many of the maps would not require a fee to use.
Custom maps in minecraft can usually be downloaded for free.
Just look up Minecraft Servers and search for 'Survival'
i just got minecraft on ps3 and I am wondering how to get maps
No, it's not legal to sell Minecraft maps/mods.
There are many tutorials on Youtube.
There are many minecraft Survival Games server. The best one I think is CraftRealms(hg.craftrealms.com).
There are many survival games IP addresses, you can easily search one on a forum.
you cant play agame in planet minecraft you can post in the forums download minecraft maps, post your minecraft maps, and change or post skins