The frame dave has pictured should give a guide idea of how to set it out. But I also found looking at guides on the internet helped me see how to build the frame.

Main thing i found was making sure I had the posts in the right place to fix the bracing to, and making sure I had bracing in the right place to fix the boards to, was a bit of trial an error.

Once you get into it it is pretty enjoyable and you want to add more and more lol!!