If you have enough money,you can do them all. But as a start up,choose some of them.
1- Groupon merchandise
2-Contact professional like dog trainers to review your item
3-submit your Coupon Code to Coupon Sites
4-Send free samples to industry professionals or buyers
5-Send postcard to buyers
6-Set up one PR news campaign
7-Google Adwords marketing
9-If sell on Amazon,contact top reviewers for product review
10-Set up your own webpage on Wix,wordpress and weebly.they are free.
11- Welcome Amazon Associates to show your items
But how to find as many as Amazon Associates guys to join your marketing campaign?
12-SUBMIT YOUR COUPON CODE ON REDDIT
13-Build quality back links to your Amazon page
14- Find some complained type reviewer on other products and invite them to review your good-quality new item
If you are selling some new product,you need to take the professional photos from the professional photo supplier.Like this one http://www.productphotography.com
Reference one: https://www.tardisk.com/?gclid=CMGVve6rw80CFQWWvQod8TIC6w
1-Recommended by ZL : http://hellosociety.com/whatwedo