Knowing when to follow-up with a lead can be hard, but here's a great system for follow-up using smart lists. The idea behind this process is to add tags based on the frequency with which you want to follow-up with your leads. These smart lists rely on adding the following tags: Daily, Weekly, Bi-Weekly, Monthly, 6 Months.
Typically you would add the daily tag to your new leads as you are trying to qualify them. After a certain timeframe, you would remove the daily tag and add another tag based on the frequency you'd like to continue following up with the lead. Here's help with adding tags.
Below is a quick video showing you how this process works. You can also watch the original webinar here: Smart Lists Masterclass with Ryan Melville