For one thing, seek for more advice in this
forum, as they'll be better equipped to help you.
If it has vision, there will be a pink plastic cover on the right side of the marker under the feed tube, with a wire tracing underneath it. If I'm not mistaken, most of them had vision in 2005.
As for upgrades, that's entirely up for you, but I would suggest leaving it be and getting used to routine maintenance, learn more about the marker and how the upgrades will effect it, then decide how you want to improve the marker itself.