I would put a nice thick layer of something on it as you clear it - compost, manure, cardboard held down with bricks, whatever. That way you will keep the weeds from coming straight back, which is always disheartening. A layer of homemade compost would be best where you plan to plant or sow straight away, though.
When I took over my little plot it was thick with couch grass and annual weeds, so after I had decided where my six beds would go, I covered three of them with cardboard or permealay, dug two thoroughly and planted them up, and just strimmed the sixth. Kept the whole thing vaguely neat and tidy despite a wet year and not much time to work on the plot. This winter we forked over the dug beds and mulched them with manure, and I'm just starting on digging the two beds formerly covered in permealay. Makes it much easier if you can take things in stages
BTW, if you put the manure on areas you are not ready to use, and just leave it for a few months, the worms will do the digging-in for you. Ignore the good ol' boys who tell you you have to dig every year - that's only necessary if you have unmarked beds and walk on the soil between rows. I have fixed paths made from old fence planks, and the soil in the beds is lovely and workable despite us being on clay!