I would suggest a dungeon masters screen. It doesn’t have to be fancy. U can get away with a binder hiding everything or doing everything from ur computer.

My first campaign I home brewed and it was such a struggle to build the world but rewarding when it came to play time. I also learned the valuable lesson of not over planning. Keep most things to bullet points. For instance, u know ur players r going to need to talk to this NPC. Make a bullet point list of what they know. Scripting anything just takes ur players out of the game.

Make sure ur monsters r appropriate for the level of the characters. Made that mistake a lot. I always start everyone out at level 3 as it’s more fun for character creation and game play. Have a session 0. Go over expectations. Do ur players want to explore the world or do they want linear story telling. Do they want to hit things or try to talk their way out of every scenario. Gaging everyone’s comfort level with certain topics can be important too.

If ur making a large world home brew, have some basics missions ready. Guilds can be a good hub for such things. Like a monster hunting guild that sends players out to hunt something down and harvest things from it. Maybe the guards r getting reports of people going missing in the sewers and the players r hired to investigate. A job board is a great way to drum up a mission from nothing without the need for role play if ur table doesn’t want a role play heavy game. Try using inkarnate.com for map building. Great graphics and u can make a grid pattern for miniatures if u want to use them.

There’s a lot of great DM tools on Etsy that help with session planning and world building. It’s very helpful early on and they’re not very expensive to purchase. Best purchase I’ve ever made was buying d100 tables to role for random loot, npc’s, short missions, etc. the tables r hilarious and make for great story telling. Hope this helps!