Will the entire thing be one model? If so, you'll need to make all the UVs fit onto one uv-space. You don't necessarily have to join the objects until you are done, though. You can unwrap each object separately, then merge the two objects and rearrange the uvs until you are satisfied.

If you are making 2 separate models, though, you can split up the uvs.

Thanks responding and basically I made shoes and a backpack object, So lets say my creation was in the game; if a person clicked a person clicked the item the shoes and the backpack would appear on the character. Would i be able to use seperate uv maps for the shoes and the backpack or would i have to use one for both. I hope that clarifies my question for you

Oh I see. You can definitely use 2 UVs. You'll just need to remember to assign 2 materials from within blender before exporting. Then when you import the model into TF2, you'll see the option for VMT1 and VMT2. If you can, though, 1 UV is better for file size. Don't necessarily sacrifice quality for file size (if it looks terrible with 1 texture, then use 2). But if you can make it look good by fitting all the uvs onto one texture, then go ahead and do that instead.

Thanks for the help, also will you be making anymore weapons I think your workshop submissions are awesome