What is the most effective method for doing something?
- Utilize existing parking websites.
- Create your own engine (website) and park all domains there, utilizing price lists and feedback.
For Existing:
Pros: No need for hosting and no requirement for knowledge of PHP, HTML, MySQL, JS.
Cons: You may not like certain aspects and requesting corrections can be a paid service (up to $100 per year) whereas what you do like is also subject to payment.
For Own:
Pros: You have complete independence and control over your website.
Cons: Hosting is required (costing up to $12-60 per year) as well as knowledge of PHP, HTML, MySQL, JS.
Ultimately, everyone chooses what they prefer.