How to upload prop/model to Garry's Mod workshop

[Fooby]

To keep this short, I have the following file types I'd like to upload to the workshop as props/models. I have: .mdl .phy .vtx .vvd I've watched some tutorials and read some guides to no avail, as far as I know I need to make these into a .gma archive but not much more. Anything helps, thanks.

[Sohald & Spike]

here: https://www.youtube.com/watch?annotation_id=annotation_2906107405&feature=iv&src_vid=oyjsjoAUfs0&v=37Ie3ditfqU

best tutorial i found, and it worked well for me

[Le_Lia]

im looking how to upload my model i have made also

[assasinian966]

ok thanks

[shadowpanda333]

I just need to upload the Skrill from School of Dragons.