The idea: it doesn't have to mean anything
Let's kill the biggest myth first: your first tattoo does not have to be meaningful. 'I think it's beautiful' is a complete reason, and forced meaning produces just as much regret as impulse. The questions that actually predict happiness in ten years are: will you still like the look of it, is the artist excellent, and is the placement thought through?
If you're stuck for an idea, you're probably solving the wrong problem. Stop trying to invent the perfect design and start looking at artists instead: browse portfolios by style and city on REAP's discover pages until someone's work genuinely stops you. Then bring that artist your rough concept, your references, your placement, and let them design something in the style they've already mastered. Find the right artist and trust them; that's the entire secret. The one boundary on that trust: never let anything go on your skin that you don't actually want. Revisions at the design stage are normal and expected, and a good artist would far rather redraw than tattoo your polite hesitation.
Sit with the idea for a few weeks before booking. If you still want it, that's signal. And size: get the piece at the size the design needs, not shrunk to 'test' the experience; tiny versions of detailed ideas are how first tattoos end up blurry and regretted. If you want to test the waters, test with a simple design, not a miniaturised complex one.