Pots

Pots

Hello, I'm new here and new to gardening! I was wondering if anyone could help me? I live in London and the only outside space I have is a terrace. It's quite big so I am hoping to use pots to plant veggies and flowers in. I have started growing some seedlings which now need transferring to a larger pot. The pots I have are thick plastic faux terracotta ones but they don't have any drainage holes. Do I need drainage in them? Or does it depend on what I am growing? I was thinking it would be quite easy to drill some small holes in the pots if I needed to. Any advice you could offer would be great! I'm growing; tomatos, courgettes, chillie peppers, lettuce, brocolli, panseys and I have some bulbs too! Also, if you have any general tips for a beginner you would like to share I would be very grateful! Thanks :)
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Flower name help

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Identification post

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Question about my sedum!

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My first flower!

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Asian Ribs