Sophie, why not start with something like a lower end DSLR?
Say, maybe a Canon 1000D? Or, maybe a 2nd hand 350D. You can shoot with them as is, or pay a few hundred dollars to get them modded - which will make them far more sensitive to Red areas of the spectrum.
Dedicated CCD cameras maybe down the track, I'd really recommend from everything I've read and seen to start off with a DSLR first before investing too heavily.
Dave
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