I'm going to jump in on this thread rather than starting another with the same title and line of questions.

I am just starting out with container gardening. I bought a 50/50 potting mix from the local organic gardening store. But, my husband bought a potting soil plus a bag of leaf compost (same store, different salesperson). I'm wondering if it's beneficial to add more compost to the 50/50, or just leave it be? The guy I talked to (whom I liked a lot better than the lady giving recommendations the first time that my DH bought stuff from) said that what DH bought could be mixed to make 2 bags of what I was buying. So, it sounds like it would be silly to add more of the compost?
I think I'm on the road to over thinking every.single.thing I do with this garden.

I really want it to go well, though, and I have almost no experience with gardening at all.

The first lady at the garden center seemed to think seaweed spray (I think?) was pretty good for almost all plants. Anyone have experience or thoughts on that? I know I need to look into fertilizers, next, so I may go straight to fish emulsion. (I want to start worm composting but haven't, yet, so no casings or tea/juice from that.)
FWIW, I've got starts of the following:
- diva cucumbers
- zucchini
- watermelon (hoping they'll cope in a container!)
- Big Beef tomato (just one)
- strawberries (4)
- lettuces (a mix they sent us for free... not sure what they are yet)
- thyme (will get other herbs, but the rest were backordered)
- a hummingbird garden mix