Restoring a dining set

Hello all
I recently bought a second hand dining set. It is not an antique, but it is solid wood, and I loved it when I saw it.
However it has a lot of scratches. At first I thought that a bit of varnish would soon make it look ok (I'm a newbie at this), but quickly realised this would not work.

I am now considering stripping off all the varnish and then re-varnishing once it is fully stripped.

The thing is that I have no idea what I'm doing. I have been looking at tools available to remove the varnish, and don't really know what would be suitable, or what I would need. I have 8 chairs and a heavy 1.5m x 1.5 table to do. I want some tools that will make the work a little easier than going at it with sandpaper alone.

Please keep in mind, that I am not going to be doing this all the time, if ever again (although i may end up being bitten by the restoration bug, who knows???)
I need some starter tools, which are not going to cost me an arm and a leg.

Help??
Are the following any good?
http://ift.tt/1iE3PYX
http://ift.tt/1iE3Pbm
http://ift.tt/1iE3PZ2
http://ift.tt/1iE3Pbr