Pay Per Click : Pay per Click is widely used to get traffic and clicks at you website , you can use Google Adword PPC and Facebook Ads PPC to drive traffic at your store.
Email Marketing: Email marketing you can use to send a commercial message to a group of people. It involves using email to send advertisements, request business & promotion of Products. Mail chimp is popular tool you can use that for email marketing Purposes.
Social Media Marketing: Social Media Marketing is effective to drive traffic at store, Popular Social Media Marketing Platforms you can use like as Facebook, Twitter,Linkedin,Tumblr, My Space ,Reddit etc.
Search Engine Optimization: Search engine Optimization is important for all kind of online businesses to drive organic traffic and its really effective and backbone of online businesses.