Try learning Python or Java, even C# is easier. I beleive Python has a very active game development community. If I am understanding what I have read about games, C++ is what you need for top notch games, but to build simple ones, where you can hone basic programming skills without the hassels of the C++ language there are several to choose from. If I had to recommend one I would say give Python a look their website has some very well done documentation. In fact to date I only know of one other language that does a slightly better job on documentation, PHP. Most languages are refered to as c-based languages so if you get one down you have a big step up in learning C++.
What languages would you suggest for a total beginner?
I would think you could make a game right out of the shoot. How much code does it take, for example, to make a text based dice game? You could probably do it in a hundred lines of code or less. Start simple and work you way up. The trick is to get your mind set on the fact you will not be starting your million dollar game idea for at least 2 or 3 years (not to discourage you).
Because I'm interested in Game Development is it advised I focus on that area more so? Or just programming in general?
By "dyscalculus" I assume you mean "dyscalculia". I guess if I was about 10 years younger I would have had it too. But as I was born too soon I never got dyagnosed, thankfully. To do complex math you need to forget the methods you were taught in school. Most don't realize it but just about every day you are doing algebra. If you go do anything were you plan to spend a predefined limited amount of money the process by which you decide how to spend that set amount is algebra. And I guarantee you didn't write out the equation and you likely did the math in your head. The basis for all math is 2+2 (addition) or 2-2 (subtraction), anything more complex than that is had it origin there. Sometimes geometric calculations require a formula but those should be as simple a basic addition (multiplication) and subtraction (division). If its more complex than that someone is just showing off and go find a simpler formula elsewhere. Knowing you have dyscalculia is likely a bigger disadvantage than the actually having dyscalculia, as it causes one to give up long before they would have otherwise.