You should know the thing with icons, that they can be BTN and DISBTN. When you import a custom icon you should write in it's path, if it's BTN, ReplaceableTextures\CommandButtons\((name of icon))
For DISBTN icon you write
ReplaceableTextures\CommandButtonsDisabled\((name of icon))
Here are also Passive icons and Autocast. The thing is the same but Autocast icons should have the same thing with path as BTN icons.
And thing with Loading Screen. You should take a screen shot using "Print Screen SysRq" key on the top keyboard. Paste the screenshot to PAINT and save it. Then you can use War3ModelEditor, which can be found in Hive's resource section. Use War3ModelEditor's "Extra" on the top line and "/Loading Screen Creator"
So "Extra/Loading Screen Creator"
Next you push the "..." button and select your image file. Then push "Generate" button to convert your image to BLP file. Then push "..." button again, select your BLP (just converted) image, and click OK.
Then go "File/Save" to save your model. Save it as MDX!
Import you MDX file and it's BLP texture to your map and don't edit their path!
Use "custom loading screen" for your map and choose your file there.
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Custom Minimap Preview:
The image must be 128x128 or 256x256 (of course you can use War3ModelEditor with Extras/Loading Screen Creator, but the file size will be over 100 KB, you can download WEU
http://www.wc3campaigns.net/tools/weu/, install (it wont affect anything), open WEU Enchancer (Autorun, dont know why it's named like that), click Create Image button and select an existing image - the program will draw borders and create a darkened version of the icon) TGA or BLP
Type in the imported file's custom path "War3mapPreview.(file's name extension)"
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