hiya, jemma..get some paths marked out and covered, that way, the soil doesn't become compacted by walking on it, mark out your beds and work on one at a time..if you're not planting straight away, cover or grow a green manure, that way, you're feeding the soil instead of growing weeds :)
also, don't panic, it doesn't have to be done all at once, we're all in it for the long haul :)