Little seedlings like water cress

I have a lot of tiny seedlings that I would describe best as water cress but 1/4 to 1/2 an inch tall in propagator trays with maybe 10-30 plants per tiny pot.

So what do I do next - these are all annual flowers - it it too late for them to grow this year? I can't pot then all on since there's hundreds - do they need potting on first or now it's warm could I plant them outside in little clumps of say 5-10?

I have been leaving them outside in the propagator without the lid and they seem OK and have been growing but are still tiny?

If I pot them on should I use seed compost or general compost?

 

We probably won't be able to comment until we Know what the seedlings are my friend.
G.man:D