First, you have a hill to climb, it's a fairly steep hill so patience is your friend. There's a lot to learn, reading the manual will help, not as much as you might think, at least not at first. This is professional software, while it's easier to use than it used to be, it's still not a walk in the park, you HAVE to educate yourself so get used to the concept that you will need to learn some of the treminology and correct procedure. I'm a musician too, it's all I've ever done for a living so no using that for an excuse. 😝
You can't really get your Kurzweil sounds "into" Logic in the sense that you might think. What you can do is setup Logic as a MIDI controller and external sound source. Then you can record MIDI tracks that both playback the Kurzweil and also record MIDI tracks that play Logic's instruments. MIDI tracks are not sound, they are small bits of data.. (what note you played, the duration, the velocity the key was struck...etc.) These bits of data can playback the any MIDI instrument, much like an old style "Piano Roll" can play back a player piano. (if anyone remembers those) There's also other performance data that can be recorded, the piano sustain pedal, the modulation and pitch bend wheels...etc. The way to get the Kurzweil's sound into Logic is to record and edit a MIDI performance, playback using the Kurzweil and record the sound as audio using the MBox.
I would think about using Youtube for instructional videos as well as one of the commercial video instruction sites.
I think it's beyond this forum to take someone from ground zero to recording level without some third party help. Unless you're further along than you let on.