Welcome in
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It's easy to look at what everyone else has and think you need it all - but I'd say for the first two years after I started, black ink and Versamark (clear, for heat embossing) were the only two coloured inks I had. And then I bought some small ColorBox inks so that I could start sponging the edges of cards, and it grew from there!!!
I'm sure you'll enjoy your stamping journey and find, as Robin has said, loads of help and information here.