When you’re new to vegetable gardening the easiest way to get started is to buy some seedlings from a garden centre and plant them out. However the range of things to plant and the varieties available are very limiting, so sowing from seed is the way to go. There are many organic seed companies that you can order from online, or you may have a gardening friend who saves their own seed and is happy to share some with you. Beware though, looking through seed catalogues is addictive and often results in you buying more seeds than you have space for in the garden!
Here is my guide for some common vegetables and how best to sow them:
Seeds that should be sown directly into a garden bed:
Parsnip
Swede
Beetroot
Carrot
Radish
Beans
Peas
Turnip
Seeds that are best sown into seedling punnets and planted out as seedlings:
Tomato
Capsicum
Eggplant
Broccoli
Cabbage
Brussel sprouts
Kale
Cauliflower
Celery
Onion
Seeds that can either be sown direct or into seedling punnets first:
Rocket
Pumpkin*
Corn
Zucchini*
Squash*
Cucumber*
Leek
Spring onion
Spinach
Lettuce
*Careful not to disturb the roots of these seedlings when planting out
It’s also important to plant seeds at the correct depth, generally 2 to 3 times their width. Keep soil moist after planting but not soggy; if you let the soil dry out after the seed germinates it will die, if the soil is too wet the seed may rot before it even starts to grow. And remember to sow your seeds in their correct season!
Sowing peas directly in the ground
Mascha's Garden 
That is really useful simple list! My advice is soak pea and bean seed on damp paper first to start them germinating before planting carefully into the soil.
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That’s good advice, I’ll give that a try next time.
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I have had really trouble getting légumes to germinate when planted straight in the ground, but this trick speeds up time to germination and germination success rate.
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