I've always had a thirst for building a rich, engaging world with a group of friends playing adventurers who explore said world, and to that end I have always wanted to be a Dungeon Master.
But, I have a bit of trepidation in venturing into a 3.5 campaign.
My trepidation largely stems from not a lack of knowing the rules, but a lack of confidence in being able to interpret those rules to the satisfaction of my players. 3.5 is MASSIVELY complex, and just to create one unique character would take a long time for a beginner DM. I have done small quests as part of a collective roleplaying experience before, but never anything as big as a campaign (even my quest consisted largely of just two big encounters in a sewer).
So, I'm looking for a system that takes it easy on the dungeon master. Any setting will do, it doesn't have to be the tradtional dragons and wizards (though for my personal preference, I'd like to rule out horror settings). My chief concern is an ease in worldbuilding and encounter creating. I've seen questions asking for good starter systems for new players, but few that focus on making it an easier task for the DM.
Arguments that 3.5 is perfectly legitimate to start off with are accepted, provided you can prove to me that is the case. Recommendations on how to make a first campaign easier for me would also be appreciated, as well as scenarios that might be a good starting point for me (though I really want to build my own).
Would an easy game to learn for players be equally easy for a DM to learn? Would the same system also be reasonable for a DM with inexperience making a campaign for players with lots of experience? And would this always be the case?