Basic questions about using Roll20 first time

I've DM'd for a while for my family and thought I would try Roll20 to make things easier. It has been just the opposite. I literally can't get the game up and running. I've read through the wiki and watched some YouTube videos and am still lost. I purchased the Deluxe Essentials Kit to run Dragon of Icespire Peak. I was trying to get token on the Dwarven Encampment page and somehow deleted the map. And there was no "undo" button. And the map was lost from the page view section up top. So I deleted the game to try to start over. But now I can't find the basic game/compendium to add. I can do the Add-ons since I purchased the deluxe edition, but I can't figure out how to add the basic game again. And if anyone wants to point me to more basic tutorials/videos that would be great. I've been working at this for several days and it is getting really frustrating. So I would appreciate any help the forum is willing to give. I'm usually pretty good at figuring things out. But Roll20 has me stumped.

I think Dragon of Icespire Peak is set up as a module.  Modules have to be selected when the game is created.  On the create game screen, there is a list of modules on the right.  I don't own it, but it should look the same on your view.

I have not bought any of the modules, but I have found resources for free for all the modules I am running for my 2 groups on various reddit forums and such.    I watched some of the map YouTube videos and it worked for me.  I followed the different suggestions, such as making the map "art" and resizing it.  It is awkward, but I did learn it overall.   

Thanks Kraynic, that worked. I think I was so frustrated my brain wouldn't function and I forgot to select the module at the start!