Yo, welcome
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Normally, some promos come in sets and sometimes you’ll find people selling them as such. Bundles can also contain multiple promos.
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Japanese market sites are good - Yahoo auctions Japan & Mercari + a middle man service like Buyee. Bulbapedia has Japanese names you can copy, paste into the search bars. This thread is also a great resource.
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Buy what you like, there’s no one right approach.
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Japanese promos are a pretty broad category, nearly 25 years of them released for a million different reasons. Just keep an eye out for cards you like the look of and go from there. You’ll see a tonne of different ones posted on E4.
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yep, you can also use things like pokemon price on the top bar of this page.
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Exactly that, opening packs is fun, but always better value to buy singles unless you have lottery luck.