Ostrogoths and slavs

[Mirconus the Great]

I moded BI a little and I made playable the Ostrogoths on the campaign(I think it's not something great... I mean it's to easy to be great). I also made the slavs to be spawned by Sarmatia to make them appear earlier (however they're not playable). There are no newskins or others except the above. I'd like to upload some files which made this little mod, but I don't know how.
Can anybody tell me how to do it?

[big bad badger]

Copy and Paste?

[Dr Fox]

make folders where all the files should write a readme zip it into a winzip file and then if you can get into the downloads section upload it there if not then just attach it to a post and give instructions on how to implement it

[Mirconus the Great]

Thank you.