I'm going to be frank: You are going to need to learn Blender. First of all, converting formats is not as simple as changing the file extension. The data between formats is ENTIRELY different. You can export as DAE and import that in Blender, but you'd still have to texture and UV the model in Blender, as well, Sketchup is horribly impractical for humanoid models, which make up the core of a mod (anyone can model a still building, but if everything rests in the hands of the human models, it won't make a difference). Sketchup also can't handle animations. In fact, Sketchup is pretty impractical for modding. It's only pro over blender is the ease of use.
Thus, that all brings us back to the solution: You're going to have to learn blender, or this mod simply won't work. Other people have tried making mods that are retextured or depend on others help, but ultimately, they end up failing.