Reddit reviews Deluxe Dungeon Master's Screen (4th Edition D&D)

I think this is it
http://www.amazon.com/gp/aw/d/0786957433?cache=c254ad1c684590a22fceba09cb626c61&pi=SY200_QL40&qid=1406426206&sr=8-1#ref=sr_sp-atf_title_1_1

Unfortunately I think they are super high priced since they stopped making them.

http://www.amazon.com/Deluxe-Dungeon-Masters-Screen-Accessory/dp/0786957433

I've never done dungeon command, but Castle Ravenloft isn't one of the best intros to 4e (some powers and characters overlap, but it is so watered down that the jump would be hard). That being said, I've played a few editions of D&D and have found 4e to be the D&D for the masses (simplified mechanics and harder to specialize yourself into uselessness). If you want to jump into 4th edition I have a few suggestions:

• Buy a D&D Insider account from Wizards. It is $70, but if your group goes into it together, you can share the email and password (it will kick you out if someone else logs in while you're on though). The account gives you access to electronic versions of the books, magazines, etc. (MUCH cheaper than going out and buying a bunch of books). The best feature, however, is the character builder. You can (relatively) quickly build a character, save it, and level it up later. It does all of the math for you and prints you powers in nice little boxes (complete with necessary attack/damage rolls and effects). There are several apps for phones and tablets that will give you mobile access for quick rule checks (most if not all require a DDI account). I use this one.
  
  
• Second if you're concerned about prepping adventures/making them balanced, I would suggest looking at Living Forgotten Realms. These are prewritten adventures that generally take 4-6 hours to complete (each module is then segmented into battles and skill challenges if you need to divide one module up into parts). There are story arcs that you can follow if you want something with some continuity. If you're willing to follow their rules, you can take your characters to any other LFR game (conventions, local gaming stores, etc.). LFR could also let you switch off DMing if everyone wants to play (perhaps each person DMs one story arc (generally 3 adventures)). These adventures give you a nice structure, but specifically state that a DM can make changes as necessary. One caveat: if you do share where you're getting your adventures, everyone has access to the mods. Usually not a problem, but can lead some to read the adventure before playing for the optimal outcome.
  
  
• Get a real DM screen (instead of using folders). They have rules that you can cross-reference. Some people enjoy map tiles, but a wet/dry erase board is generally a cheaper and more versatile option.
  
  
• To get over the initial shock of entering into D&D, look to see if a local game store has LFR and sign up. Most DMs in these settings expect new players and can help you learn the rules.
  
  TL;DR Sign up for D&D Insider and try Living forgotten realms. These together make for an easy way to get a group into 4e without having to transition from game to game (which aren't necessarily similar enough to consider training).

http://www.amazon.com/gp/product/0786957433/ref=oh_details_o00_s02_i00?ie=UTF8&psc=1

The OP's DM screen is riddled with errors and pre-errata / pre-Essentials rules. If you have the Dungeon Master's Kit's screen or the Deluxe screen from 2011 then your official one will be more accurate. Even the original 2008 screen will have fewer errors, though it won't account for errata / Essentials rules changes.

If you played Gamma World, I'm assuming you mean the most recent version, built off of D&D's 4e rules. If you're not really attached to 5e, here's the deluxe 4e rules, 100% compatible with Gamma World 7?e

http://www.amazon.com/Deluxe-Dungeon-Masters-Screen-Accessory/dp/0786957433