Beds should run north to south, if you can.
Lay out all the beds, this divides up the plot so it's less intimidating :P
String, string and more string! ;D
Bottles over the stakes/canes so you don't put your eye out :o
Measure in blocks of 'path plus a bed' (say, .6m for the path, plus 1.25m for a bed), and be prepared to adjust later in the light of experience (I changed to 1.1m for a bed so I could reach for the middle, leaving .75m for the path)
Leave edgings til you are completely happy with the layout
Cover what you can't deal with now with black plastic (which you can plant through), and just take it one bed at a time.
Plant as you go, as soon as even a small part of a bed is ready. You'll be planting in blocks or short rows. This is Good for Morale ;D ;D ;D
Good luck, enjoy your gardening!