First digital product, no selling experience. Best platform to start on?

Hi guys! I made my first digital product (a dog care PDF) and have a small following to launch to, but I’ve never sold anything before. Trying to pick the smoothest and cheapest setup.
• Gumroad, Payhip or Lemon Squeezy for a total beginner?
• Worth creating my own site or overkill?
• Which has the lowest fees/any hidden costs?
• Anything you wish you’d known before your first launch?

Just looking for some advice, not promoting anything. Thanks.🙏🏼