Since we have Reforged on the horizon, I think the best approach in general is to go vanilla on the editor, as this is far more likely to be supported in Reforged.
I find that the recent patches have made the editor considerably more powerful, and the next patch will apparently be even better.
Since you say that you're a total newbie, I'd definitely recommend that you try to do an RPG type map. The basics of what you'll need can be done entirely without triggers, just by placing a hero, an altar, and deleting the melee initialization trigger. Then you can gradually put more and more details into the map, starting with things like hero selection systems, hero revive systems, loot systems, and the likes. It's a very beginner friendly approach, because the map is playable right off the bat with zero skill requirement.