No, set the height of the brooder to roughly the level of the chicks' backs (you'll have to adjust it as they grow), then put the food and water beside it. The chicks will come out to eat and drink, and will then pop back under 'mum' to warm up again.
Keep an eye on them for the first few days to make sure none of them get caught out in the cold (they'll soon tell you if that happens!), and to make sure that they have all figured out the eating and drinking thing too.