Hi mistyblu, welcome to the vine,
This year I have tried the 'cut and come again' salad leaf mixes....great results
I use a full seed tray half filled with compost, sprinkle in the seeds, a fine covering of peat and away they go. I get another tray going two weeks later.

Good luck with your veg in containers, sorry i have little knowledge of this as I grow on my plot.

Try asking the question else where on the forum.