You can build an affiliate marketing tracking system by using tracking tools like Affise or Post Affiliate Pro. You can start by generating unique affiliate links for each campaign or traffic source. You can add tracking IDs to your links to differentiate them. You can integrate these tools with your website to monitor clicks and conversions. You can set up conversion tracking on your site to measure sales and actions. You can organize your links using a simple spreadsheet or an affiliate dashboard for easy access. You can analyze performance regularly and adjust strategies for better results.