Fixed Income - Write up or research report help!

I recently got asked to put together a write up or research report on an a high quality corporate issuance of my choice. I am familiar with the fundamentals of credit analysis (I am a CFA charterholder), however, I am very unfamiliar with where to go for credit research and information (my background is on the equity side). Also, I have no idea what a "write-up" for a corporate issuance should look like.

1. Does anyone have any examples of a credit research report or write up?

2. Where does one go for research on credit issuances. I know the big three - Moody's, Standard & Poor's, and Fitch Ratings, but are there others?

I know I'm not thinking about everything...any insight, tips, recommendations would be appreciated. Hoping some of you guys come from the credit world and can provide some guidance! Thanks!