somewhere on this or the tmt forum you'll find the milkshape import/export plugin get that and put its contents into the C:\Program Files\MilkShape 3D 1.7.0 folder, this will allow you to import and export mohaa models.
You can also use milkshape to texture your model have a look at this basic tutorial should teach you what you need to know to skin
http://www.paposo.com/GSE/tut2p2.htm
Ok when you've skinned your model save it and click file -> export -> mohaa skb then just enter the name for your model and click ok/export this will create 3 folders in your mohaa/main folder named models, textures & scripts now you should be able to right click in radiant and in the menu you will now see milkshape and then in the submenu the name of your model thats it......
When you wish to distribute put the 3 folders - model, scripts and textures into your maps pk3 file.
Hope that helps.