you need newer cards even for fun... money makes fun
But it can be done. I know it might not give me any profit. I just want to get startet and see how it works.
Try to go to ethermine.org and look into how to section. You will find all the answers you need there.
I don't see any "How To Section" and I can't see how to sign up in the ppol.
A simple minergate GUI app will get you going with Ethereum mining. They are good with NVIDIA cards.
But I think you'd need at least 3GB graphics card to at least start as my 2 GB GTX 820m showed not enough memory error.