What are some good ideas for a slingshot?

I’m attempting to make my first ever weapon and I’ve decided to make a slingshot. This will be my first time constructing a weapon of even small playful proportions. In fact I’m not very experienced with constructing anything.
I found a forked stick and I’ve started de-barking it. I plan on tying a few thick rubber bands to each end and attaching them to slits in an old shoe soul. Anyone have any suggestions for improving it? Maybe a different idea for the sling or a replacement for the forked stick? I just need some ideas in my head so I can improve it.