My cousin’s Warhammer Legacy: can you help me identify this?

Hey guys,

I'm hoping you can help me out.

My cousin passed away two years ago.

We were close and both loved tabletop games, although I've always been more into RPGs like DnD while he was into wargames.

We were always interested in each other's hobbies but never took the plunge.

He was a big Warhammer 40K fan, and after he passed, my aunt told me he left me part of his collection. I broke down in tears. It's been two years, and I hadn't opened the box until now.

I found a bunch of miniatures.

I know the blue ones are Space Marines, but I don't know what faction the black and white ones are.

My questions are: * What miniatures are these? * Is it possible to play 40K with them now? * Do they have a name? Where can I find their info? * Do you recognize any of this?

I uploaded pics of each miniature. I didn't upload individual photos because Reddit only lets me post 20 pics, and there are over 20 different "types" of soldiers. Thanks in advance for any help!