Theres a huge difference between admining a server and creating mods for MTA. There could be some overlap but thats up to the mod as the mod will define what capabilities the admin has - entirely. It'd be possible to create MTAMA for Blue, but some much of what MTAMA tries to do (i.e. create game modes), can be done in substatially better ways. Blue offers the ability to do whatever you want with GTA, so for example, client prediction is possble - somthing a server based mod could never do. Either way, I'm sure MTAMA will exist for Blue, otherwise Aeron would have nothing to do, but it will probably be in a different form or require a total rewrite.
Anyone who has scripted with mIRC should be able to go into one of our sample mods and mess around and see how it works. Its not a case that you'll have to go and learn C++ back to front, you'll just have to work out how to use it. We hope that there will be lots of examples & snippits avaliable too.
The admin interface will be open and acessable in many ways - hopefully this will prompt the development of all sorts of interesting admin tools or systems.