Hey glad you got it all working, this is normal and I would think everyone goes through a few weeks of frustration before you can get this junk to run smoothly. It's been 10 years for me and I still fight with it from time to time.
Ha ha, Midi cables used to be on the shelf at Radio Shack. And they used to come with a new synth or piano. Now you probably have to order one from Amazon. You'll only need one, unless you plan on playing the sounds in your JV30, But if that's the same synth I think it is, the TTS-1 will blow it away. Oh, that's right, until you upgrade you don't get very good soft synths with LE.
I installed my version on my office computer and I couldn't play any of my songs because of all the missing stuff compared to 8.5 and X3. Go to the KVR web site and looks for a few freebies.
LE is a good start into the world of Sonar but you will outgrow it pretty fast. The layout, recording and editing is pretty much the same as the upscale versions, but it really comes with zilch in the way of VST instruments and efxs.
Make sure you register with Cakewalk and ask to be on the mailing list. They sent me an offer to upgrade to x3 Studio for only $98. Huge difference, it comes with more stuff than I'll ever use. .