I am considering starting a vegetable garden (I am completely new to
gardening). I was thinking of starting with a 10'x10' one. The patch I
have selected gets the most sun but it is currently a lawn, so I need to
know what I should do here?

Do I remove the lawn in the section in question and put new topsoil down
(this seems like an expensive option)

Do I plough the lawn into the soil?

Or is there something else I should do?

Also I live in the North of England and summer is over, is there a preferred
time of year to prepare the patch?

Thanks.