Converting map

[LO1ZB]

No, you don't need to convert it as the server uses the Anvil format as standard. Just put the folder into the MCServer folder.

but how do i choose wich world to use?
in the server.ini file?

My main problem is the players profile and items, they don't load correctly from the single-player.

As I know, playerdata isn't being read from Anvil while importing a map.
Playerdata is saved per player in the folder "players" as json.