Hi Imperator, You can add everything manually. It will take some time. Have you started trying yet? Feel free to ask here with any specific questions about adding a specific element. You can add maps. You can create Tokens. You can add Text into Roll20 Handouts. You can upload PDF and share them within your Roll20 game's Journal. You can fill-in character or enemy stats on Character Sheets that area already made for Alien. Your first step is the "Create Game" button in Roll20, and choose Alien character sheet. You'll learn about the option to use Roll20 Alien Character Sheet or Demiplane Alien Character Sheet. However you could also save yourself a lot of time inputting the info, if you decide to purchase Alien products directly from Roll20 Marketplace, and then everything will already be set up for you within Roll20 and you wouldn't have to manually copy things from your existing books/sources that you already own. Here's a look at those Products: <a href="https://marketplace.roll20.net/browse/publisher/505/free-league-publishing" rel="nofollow">https://marketplace.roll20.net/browse/publisher/505/free-league-publishing</a>