How many beads should I buy for my wife on a pandora bracelet to start?

I want to buy her a Pandora Bracelet for V day, but they are very pricey based on how many beads you put on it? I want to get her quite a few to start so it won’t look stupid without alot of charms. How many charms/spacers, etc, is a good place to start?

You don’t have to start with alot of beads. She will probably want to pick out a few herself so maybe get around 3 to start, like a birthstone bead, a glass bead in her favorite color and of course a heart, as well as giving her the booklet that shows all the beads so she can have some fun with it herself. It is a VERY thoughtful gift!