If you keep spamming the same messages, you will be punished and / or banned. . .
To answer your simple question, you update WC3 to the required version (some maps need 1.24 others 1.23 due to major WC3 change) and then download the map into your maps folder in your WC3 install directory. Finally you go to custom games from within WC3 and test the map. If it is a spell map, then you simply open it up in WE and press test no mater where the map is saved.
For models, read the import tutorial. You download the model, import it into your map using your TFT WE and then save and restart. If it needs any custom textures, then you will have to import and path them correctly as well. Finally choose your custom model like you would any model for that field and use.
Really, do not spam the same question, rather ask it once in the WE help zone and be done with it.