How do I earn BE and RP on the PBE server, and are there all skins?

Well, I see that there is a quest that gives you 3K rp i think, but is there anything else where you can get RP? Oh and some skins cost 1 blue essence and some cost their original price of RP? why is that? And are there all skins i was searching for elementalist lux or Project nami or some skin like that but when I search those skins they don't show up.
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