What Veg is good for a beginner in a raised bed?

The best advice is to grow what you like to eat. Runner Beans are very rewarding but they do need a lot of space, you might get away with 6 plants growing up a wigwag of canes at one end of your bed, you could try cramming in a couple of courgette plants. At the other end of the bed I would go for onions, carrots, beetroot and maybe radish as well.

Just an observation as it's difficult to see from your photo - is the bed on a concrete base in which case your soil depth is not enough - or hopefully its just concrete around the perimeter?

 

I would start off the beans and courgettes in pots in the greenhouse or in your propagator indoors mid April time.

You can buy Onion sets which are just small onions, you place them in the ground and they are easy and reliable to grow - plant them in the bed as soon as possible (although I haven't planted mine out yet - the next two weeks would be good).

Or you can sow spring onion seed direct in the soil. You want to sow the carrot, beetroot and radish direct in the soil as well (don't try starting them in pots otherwise the roots grow in funny shapes). I would sow a few now then again in a couple of weeks time etc - that way you get a succession of veg ready over the summer rather than them all coming at once.

Edit: maybe delay the radish sowing for a month, I reckon it's a bit early yet. (i.e too cold for them)

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You don't have to, but I do, I use horticultural fleece, mainly to stop the flipping birds pulling them up (and it also helps retain a bit of warmth, although onions are completely frost hardy).

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I'm not too sure about your strawberries, I think they are hardy so can go out now - must say I've only ever grown them outside and they don't mind the cold at all.

Your tomatoes should not be in a cold greenhouse, anything below 10 deg C and it will really slow them down, and they must be protected from frosts (bring them indoors overnight if frsost is forecast).

Chilli and peppers needs sowing now as they take a long time to get going.

Cucs can be sown in mid to late April.

Pot on all your seedling after they develop their first true leaves. Then you might need to pot them on again after another 3 or 4 weeks.

Planting time depends on your location and last frost date, for me it's early May - then it's safe to plant toms in my greenhouse (down here in Surrey).