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Where is the best place to look online?

Thanks in advance...

Lexicanum or 40k wiki i suppose or maybe the Index Astartes books.
For the Blood Angels you could simply pick up their codex.

Lexicanum states that the Space Sharks specialise in drop-pod assaults and occupy the former homeworld of the Mantis Warriors. Not much else on them.

For Blood Angels, you can find a lot of good stuff on the GW website alone.

In IA9 Space Sharks have the name Carcharodons. You could try that. They are likely to figure heavily in IA10 as they only joined the Badab War fairly late.

I know that is not "online", as you requested, but it is the best help I can offer.

If you look up the Badab War, you might find a few tidbits.

I assume you have already looked at Lexicanum and the 40k wikia.