An expensive box with glossy graphics will not increase your sales. On the other hand, you will be showing your game to people, including magazine reviewers and potential publishing partners. You want your packaging to look clean and professional. Put some effort into making a nice disk label and printed manual. Web Page Virtually all games, shareware and retail, have web pages.
Some authors are better at making web pages than they are at making games.
Regardless, you should plan on having at least some kind of web page for your game. It will serve as a marketing tool, as well as a place to refer potential customers, team members, investors and publishers. Other Marketing You will need to send out press releases and review copies. You will need an attractive web banner to draw users to your site from other sites. You may want to design advertising for magazines or newsletters.