Did you sort out the rear sprocket issue of a previous post?
That cover is held on by two dowels once the screws are removed and the old gasket and age can make it stick somewhat. Making a cardboard template with an outline of the cover and placing the screws in their respective spots helps reinstall them correctly, as they are different lengths.
The bigger issue, if your a newbie to working on these is the kick starter shaft will try to also come out with that cover removal. It isn't a big issue, as it can easily be put back into the correct spot, yet requires some knowledge of where the return spring mounts on two tab positions in the main case.
If you go ahead with this, as the clutch case comes away from the engine cases, push the kick starter shaft back into the case, as it will likely hang up on the oil seal and be drawn out as noted above.
If your going to remove the clutch plates to check them you will need a C clip set of pliers, as the hub is held on with a C Clip on that model of bike.