Not sure why u want to skip campaign if u never played it. Its nice to know the story and from where different tilesets are coming. I'm not a big lore fan but well its a content that you will enjoy when u doing it first time. I'd just try to finish the campaign before 9 november, and then make a fresh char on next season with adventure mode unlocked. Campaign also guides you through all the important places in game (bosses etc.) so its experience that will be quite handy when you start doing adventure mode.
If you really want to rush to adventure mode, you should join some communities (there are power leveling communities there), just try to find active one and ask politely on chat. You might not get immediate response, but theres big chance that someone will help you.