glad you like it! =D
1) Go into the Import Manager and click the import icon. Sadly, there is no way to import them all at once D:
2) I wish they had a way to import the data, but the map maker left it blank or normal so that others could change them to how they want them.
3) The paths I belive will be "model name here.mdx". Otherwise, if that doesn't work, leave it as "WC3mapimported/name of model.mdx". :/
There are 3 maps that I know of, but they are mostly repeats, with only a couple of new doodads. D: What I did was take all the doodads and put them in 1 folder so they can be imported easily. =3