Honestly, I avoid ERwin almost completely. I've found that a whiteboard has more utility in data modeling. Or a dinner napkin and a Sharpie. Haven't touched ERWin in about 5 years. Used it for a while way back when, but only because I had to, not because it actually did anything useful for me. Could be I'm missing something key in it, but if so, it hasn't stopped me from getting my job done yet.
So, color me cynical on it.
However, if you find it useful (and I assume you do since you want to train a new DBA on it), so do lots of other people and you're in good company.
I'd start with the material on ERwin's Recommended Reading page: http://erwin.com/reading/
On the same site, they have discussion forums, support groups, and a bunch of other resources under their Support and Community tabs. Start there. You'll be likely to find people a little less jaded about it than I am.
- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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