So, I was playing at my favorite server yesterday and the admin wants me to make a model for them. This model is suppose to be a glass cube that can hold some marines to act as a ready room (on maps that don't actually have built-in ready rooms). However, I have no idea where to start. I got Milkshape but this thing makes no sense and isn't helping me whatsoever. Could someone please tell me what I need to do? I have always wanted to learn how to make some models for games, and this would be a decent way to start. Please help, I would appreciate it very, very much.
Side Note: I want to physically make this model myself but some guidelines would be good.