Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
The key to building a successful website is to stay the course, make a website that’s professional and something your readers are going to find useful and that they trust. Your job is to build trust with your readers and offer something that they are looking for. Otherwise, you will be building a website nobody checks out and you’re just wasting your time there.
Social Intelligence – Canny marketers are making use of social intelligence to stay ahead of the pack. They are using social media channels to listen to their customers and become more responsive to their needs and feedback. Social intelligence is helping marketers to look into the future and optimize their products effectively to cater to changing customer requirements.
Provide excellent customer service. Answer any questions buyers post as quickly as possible. Be professional and courteous. Positive communication builds your reputation with buyers and gets you return business. Also, package your product well and ship it out quickly. Allowing an item to become damaged or taking too long to ship can negatively affect your reputation among buyers. Wrap all items, especially fragile ones, in appropriate packaging. Commit to shipping items as soon as you receive payment.