I don't have them on here anymore. I can try to help with the current sheet though. By rolling an Action & Target should tell you most what you need (your Mission, as it were). If you want to flesh it out more, then roll Source. This is who gives you the Quest. May not need to roll that every time (maybe it's just posted on a job board!) the Where table is there, again, to create more narrative around the Quest, likely told to you by the Source. Opposition is optional. Again, to create more narrative and a clear "opponent".
Hope this helps. All the tables in the sheet are here to just help. Roll or ignore as you see fit. I suggest starting sort of small. Simple fetch quest/destroy baddie quest just to get going. No need to roll at all! Tables can then help when you get stuck.