While we all start at 0 followers an account with up to 500 followers can be considered a beginner’s account.
The number of followers does represent to some degree your reach, yet Pinterest shows your Pins also to Pinterest users who are not your followers.
Therefore, creating good content with SEO-optimized descriptions and hashtags is always going to be more important for your actual reach than the blank number of followers.
Therefore, there is no need for you to wait to reach a certain number of followers before starting to Pin.