What a great project for you and your family. Especially if you've not grown veg before. It's also a great time to start getting it together now.
If your DH is even vaguely handy he can manage this.
If the area is really full of perennial weeds start by using a weed killer like Round Up (safe to use before veg planting) If you plan to be completely organic, you could skip this and just cover the ground with old carpet, build the beds and then dig it over in the spring.
Measure out the size and shape of your beds.
My DH brings all sorts of wood home. My best bed is from two old scaffold boards. Long planks about 6" x 2" He puts 4 short posts in each corner of the bed, and simply attaches the planks to them with screws.
Use a spirit level to make sure they are level at the top. They just sit on top of the soil. Clear weeds, dig over soil to about one foot deep and fill to the top of the planks with the best manure/compost you can get your hands on. 18" of dug over soil with plenty of organic matter in it, will give you amazing beds.
Don't go spending a fortune at the garden centre. There are loads of freebie websites that you can pick up topsoil or farmyard manure from. You have loads of time, so if you can borrow a trailer and do a bit of research you could do the whole lot for no cost at all. That way when your first veg hits the table, the satisfaction will be fantastic.
Start saving yoghurt pots, ice cream tubs and any containers for starting seeds off next spring. It's a fantastic project to get kids involved in.
This is a great site the forums will answer any questions you have.
If you do get someone to set them up for you i'd love to know what they charge. I have toyed with the idea of setting up veg patches for 'newbies' and would love to know if its viable.
Good luck.