You
should look into whole home osmosis systems if you want to utilize the well water, but they can be expensive and limited in capacity depending on models/consumption. You can put in-line before the osmosis filter some whole house filters to take the brunt of the lead/heavy contaminants to protect the osmosis membranes from premature wear. What you will need and how to set it up will be specific to your water and your site.
Do you have numbers for your Lead and Iron Levels?