I assume that you already have the freewheel off of the bike. If not, do a search on BF.net to find out how - you need a specific freewheel tool. No getting around that.

Your best bet is to just pour oil on the backside of the freewheel and let it find it's own way into the workings of the freewheel. There is very little good reason to take a freewheel apart except for the sole purpose of seeing how they work; kinda like disecting a frog - don't expect to be able to fix anything inside, or find anything that your friends will be interested to hear about. Usually, you end up with a mess.

That said, to take the freewheel apart, you have to unscrew the front plate. Usually, there are two drilled holes in the face plate or horizontal slits that you can put a screw driver into. There are tools for this purpose, but...

I use a nail counter-sink punch tool for this job. Put the head of the tool into the hole in the freewheel faceplate and use a hammer to tap until the faceplate starts to unscrew.

Once you get the freewheel open, the tiny bearings will come pouring out, so have a towel under the works to catch them.

Now, you will find you have created a helluva mess.

Good luck.

Hey, Ricohman, contact me if you need a replacement freewheel when you are done. I will sell one to you.