I expect you are speaking of free realms. A world/Realm is a server for overflows. In the event that one server carries it's max amount of people, the overflow would be sent to the second world/realm.
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That means that the realm is either full or almost full.
The only way to do this is to transfer your character with the gold from one realm to another and then trade it over. i should also mention that there is a limit on how much gold a character that you transfer from one realm to another can take.
a realm is like a server.
You have to be a subscriber to get into test realm (i think). If you are, then type in google: wizard101 test realm download. you will be able to download it and get on. hope this helps!! :)
yes