Low-Cost FB/IG Lead Campaigns

I’m planning on Facebook and Instagram ads focused on one thing only—qualified leads. The ads must send traffic to my own interactive eligibility form (5–6 quick questions plus contact details); I do not want to use Facebook’s native lead forms... (Budget: $10 - $30 AUD, Jobs: A/B Testing, Advertising, Conversion Rate Optimization, Digital Marketing, Facebook Ads, Facebook Marketing, Instagram Ads, Lead Generation, Marketing)