Ordered a Neutron… now what?


Hello, everyone. 

I'm a noob to the music production scene but am old enough to have been imprinted by analog synths in the late 70s and new wave in the 80s. I've ordered my first synth; the Behringer Neutron and will receive it soon. Given the price and sound, I think that I might be a fan of Behringer.  Given that I'm a complete newbie, I'm wondering what a "next" purchase should be in order to maximize my value of the Neutron purchase. I am drawn to the Behringer semi modular products but since I don't really know what I'm talking about yet, I was wondering if there is a clear "you must have" with your Behringer Neutron?

Most respectfully,