Hi Boonoff, welcome to the site.
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Before answering your question I would like to know a bit more about this space you have. Is it currently lawn, vegetable garden, paved or bare? Is it under a fruit tree or a hedge or out in the open? Also, will you need to keep your hens inside this space the whole time?
Deciding how many hens to keep is as much about quality of space as quantity, so knowing more about the space will help us to advise you.
I currently have six chickens that range in my large yard, mostly lawn but with several fruit trees as well. I think they would be happy in that size space, but they would soon strip it bare of any grass and I would need to cover the soil with some kind of dry litter such as fallen leaves, wood shavings, pine needles, etc.
Six Light Sussex hens would lay about 1200 eggs a year (on average) so that's about 100 eggs a month when they are in full production. How many eggs do you and your family need in a month?