Don't believe anyone can answer that for you. What would you like to sow? Flowers or veg? Take a look at online seed catalogues and see what inspires you.
Almost anything, they look and sound a pretty standard size for module trays. Probably not runner beans or sweet peas as they like a deeper root run. Some things are best sown where they want to grow or in larger pots but as @Jenny_Aster says what would you like to grow?
It would be easier for us to say yes or no, than try and list all the hundreds of things you could grow.
If you have a garden and a library, you have everything you need.”—Marcus Tullius Cicero East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham
@Sheps if you like spicy salad leaves to go with your lettuce, you could sow some of those. "spicy salad leaves mix" ( Mr. Fothergill ). "Mixed leaves Elegance" ( Johnsons ) are a slightly milder mix. Various Mustard leaves too. Those 3 tend to germinate more or less at the same time which makes life a lot easier Rocket takes a bit longer as does Land cress. As Lyn says, 48 lettuce of the same variety all at once may make you go off the idea altogether If you want a bit of colour to add to your plain green lettuce - the Lollo Rossa or Salad Bowl Red are ideal and can be used as Cut and Come again. BTW, if you are careful and use sharp scissors, you can cut your 48 cells in half. Here's wishing you a successful Salad Season
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Also take a look at what to sow in April
https://www.gardenersworld.com/plants/what-to-plant-april/
Cambridgeshire/Norfolk border.
It would be easier for us to say yes or no, than try and list all the hundreds of things you could grow.
East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham
Do you like salads?
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
As Lyn says, 48 lettuce of the same variety all at once may make you go off the idea altogether
If you want a bit of colour to add to your plain green lettuce - the Lollo Rossa or Salad Bowl Red are ideal and can be used as Cut and Come again.
BTW, if you are careful and use sharp scissors, you can cut your 48 cells in half.
Here's wishing you a successful Salad Season