I've got all that stuff available to me. Plenty of ethnic stores all over the place - just no clue what to do with it.
The top one I know by the name nigella, aka kalonji aka black onion seed. According to Tony Hill's
The Spice Lover's Guide to Herbs and Spices you have to make sure you have the real thing, as sometimes you get black cumin (below), black mustard, or even black sesame seeds. The slew of names for it only adds to the confusion. The seeds are "almost triangular" in shape.
Tony's got a few recipes that include it, including his Ras El Hanout, which he says is good on roasted meats, in casseroles, stews, or ground as a condiment. I'd type it all in, but it's got 20 ingredients
Here's his Panch Phoron, which he says gets tossed in bread doughs and ground into rich soups in beans and lentils.
1/4 cup each of nigella seeds, fennel seeds, cumin seeds, fenugreek seeds, and brown mustard seeds. Use whole or cracked as needed.
The second one is black cumin, aka kala jeera. It is brown rather than black, thinner than common cumin. Tony describes it as "musty in character with grassy hay aromas". He uses it in his Kashmiri Garam Masala:
6 Tbs coriander seeds
4 Tbs Tellicherry peppercorns
2 Tbs cardamom seeds
2 Tbs black cumin seeds
1 Tbs whole cloves
a generous pinch of ground mace
2 tsp freshly shaved nutmeg
2 tsp cassia-cinnamon chips
These should get you started. Tony's a friend from when he lived in Seattle and owned his spice shop, although he's since moved to London and we've fallen out of touch. But regardless of that, I highly recommend his book if you're looking to understand some exotic (and even common) spices.