They didn't help or you didn't read them?
What you need is really simple. You should take the time to think about it. But ...
1st. What size map would you like?
2nd. How much of that map are you showing at one time?
3rd. How may layers do you need?
As to your question about load map. Each cell contains an integer value of the tile in the datafile.
p = map.cell[ j ][ i ];
There are 256 tiles. p is from 0 to 255.
I'd explain this more, but do a damn search on these forums. I've explained this more than once before.