Top right you'll see a box with three horizontal bars - that's your 'customise' button. Click on it, then click on 'settings' in the drop down menu. You'll see an option 'On Start-Up'. The third option down allows you to set a specific page to open when you start Chrome. The next option down - 'Appearance' allows you to show the 'home' button and to set a page as your home page.