SO.... Using the ACW to figure things out when you are first getting started can be an exercise in frustration. I know the problems I have encountered trying to use it and I halfway know my way around BB.

try it this way.

Open a new project and select STYLES.... the style picker opens and you can then listen to the styles in BB in the demo mode. Use the filter for genre to limit the option to that particular genre..... Pop, Medium rock, Salsa, Easy jazz.... etc... whatever you think the song needs to be.

Once you find something you think would sound good and work for your potential song.... Select it.

Most songs have 3 basic chords... which are the 1 the 4 and the 5.... or in a key of say C major..... the C the F and the G. Knowing that... start with a C and add the chords necessary to fit what you're hearing in your head. You can easily change the tempo and the key if it works better in a different tempo or key.
While you may not know much about BB now... or music theory... you will learn quickly and be able to create new songs quickly and easily using this method. Even now, I still start out pretty much this same way as I just described. Pick a style, and start entering chords.... add, delete, copy, paste, delete, and in no time I have a song that pretty much works. Once you get a verse...and a chorus..... use Copy/paste to quickly add the remainder of the verses and choruses. This saves a lot of time.
Delete the measures/bars you don't need and hit the ending..... waaa laaa.... a song is born.

Ask more questions if you run into things you don't understand or can't figure out. Also.... watch the videos in the video support section of the PG music website. LOTS of good solid advice and information to be had in there.

Good luck

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.