How the passwords will work in my level sets/How many levels should I start off with when creating my first level pack?

[1033Forest]

If I ever make a CC levelset, the passwords will work differently that most other level packs due to the addition of numbers into the letters. They will still be 4 characters though.

So a password for one of my levels could be something like: POB4. This means that a password could also be just a 4 digit number.

Most of the passwords will be randomly generated, but a few of them could be specifically chosen for certain levels.

Also, how many levels should I start off with when creating a levelpack? I was planning to make one with 577 but I should save that one for a later set since that's too much