beginner jumps to me are just little cross poles and such.
Get some milk crates (you know, the square plastic ones). They work perfectly for making little 'standards' for cross pole jumps and little verticals. They are also VERY easy to move around the arena for setting up/disassembling jumps.
I use milk crates myself, for making little jumps like I described, and also for 'markers' around the arena for things like turning, marking out circle distances, etc.
I ask around at local businesses like mcdonalds, etc if I can take a few milk crates. Usually they are fine with that. Free jump equipment, thanks!