- Put yourself in the shoes of the customer and try to understand what they probably need and offer that.
- You have to understand your own product and what you offer, be clear with what you offer and what it costs and what your terms are.
- Make sure it is as easy as possible for you customer to purchase your product. Remove everything that gets in the way and hinders the customer from giving you his money. That means stripping away cookie banners, newsletter modals, "Adress line #2" and all such nonsense. Every bump in the road for the customer is an increased % that the customer desists.
- Your website should be fast, responsive, informative and easy to navigate. Nothing should be left to chance. If you think your website is a hassle you've already lost, the website is your most important asset. Don't forget to submit it to Google!
- Social media is a waste of time unless your business is huge. Make 90% of your investment in your own website, you can put any content there just as easy. But do make social media accounts with some basic info just so people know you are serious.
- Get your initial web site online as soon as possible, it takes some months to start ranking on Google, unless what you offer is extremely unique and interesting.
- If you use any paid advertising you should use promotion discount codes in order to know which channels actually work and bring paying customers. Too many get sucked into Facebook and Google advertising games, where they keep "betting" small sums and changing some targeting metrics to try to "hit the jackpot". Don't do that.
- You should always test and test again the purchase flow for your customer, to make sure there are absolutely no hurdles or errors stopping them from doing business with you.
Edit: One more: The absolute worst thing you can do is to not publishing a price because you are worried that you'd miss out on charging more for a bigger customer or because you're worried that you'll sell too cheap. Figure out your costs and margins and publish your prices. You can't figure that out after a customer has contacted you.