Please, please, don’t create development plans.

Formal development plans are, like annual performance reviews, largely a corporate construct. 

You should know what each of your employees hopes to achieve: Skills and experience they want to gain, career paths they hope to take, etc.

So talk about it--informally. Then assign projects that fit. Provide training that fits. Create opportunities that fit.

Then give feedback on the spot. "Develop" is a verb. To develop requires action.

"Development" is a noun that sits in a file cabinet.