If your not great at building you can buy a pre made raised bed but they are kind of high. My advice is however find a buddy that is good with building trade them eggs to show you how to do it. Your not going to be happy with just one..... Just ask my husband
seriously though a power drill, a handsaw, a tape measure and a hammer are a girls best friend! If you try to build one and you don't get it " perfect" then it has character and you will feel proud that YOU made it . You can also repurpose old dressers to make raised beds. Pull out the drawers and cut out the dividers drill holes in the bottom ( aka the back ) or cut it off completely. I actually love those because I do have clay soil and have trouble growing root vegetables. I love the deep ones for carrots.
I would also look into a few fruit trees (not sure how big your yard is ?) but most fruit trees don't mind wet feet.