I'll try explaining better
You can make scripts be using Notepad, you can learn how to do stuff by looking at other scripts in Blockland/Add-Ons, the files are in the .zip files, when you're done, you can save the file as server.cs, i think that's what it's called
As for modeling, you'll need Milkshape 3D, you can get it here
http://chumbalum.swissquake.ch/ms3d/download.html, then make your model, then when you're done, go to File then Export and click Torque Game Engine DTS, and remember to use textures for the model, you can use blank.png (Found in blockland/base/data/shapes i think), using blank.png will allow the colorShift line in the .cs file to take over the color of what ever part of the model that uses blank.png, to use custom textures, it's suggested to use a .jpg file, you could use .png if the image has any transparent part(s), it can be 512x512, 256x256 or 64x64 in pixels
When you're done, make a .zip called (for example) Weapon_WEAPONNAMEHERE, then put your .dts, .cs files into the .zip, and don't forget to drag the textures the model (.dts file) uses into the .zip as well
Then to test it, start a single player server by clicking Start Server on the main menu, and click the Singleplayer button towards the bottom middle of the Start Server window, and you'll see an Add-Ons button around there too, click it, and scroll through the list of add-ons and click yours to check it, then try it out in game
The reason i say to do a single player server is so that you can test your mod in peace and not have the trouble of other people getting on your nerves or spamming up your server
That's the best i could explain it, hope it helps
