You could have saved yourself a lot of work. I now let the worms do the digging. A really good book for you is Bob Flowerdew's "The No-Work Garden". It's a gem, and will give you loads of encouragement.
But on with the task. Rake it over. This will smooth it out and make it a bit firmer. Get a couple of bags of farmyard manure. Erin do one and there are others. Suggest you try google. Spread this about 30 to 50mm deep and then pop the plants in at soil level. You don't have to dig the manure in, the worms will gradually do that for you, and far better than you can manage.
Go to a nursery if you can find one that grows their own plants, they will be better value, but read BF's book first.
Alternatively, surprise yourself with your amazing skill. Get some French Marigold seed, and after raking the soil, water it well, (you will need to collect rain water for best results) and put the seeds in one at a time, point downwards. 100mm apart. Leave the manure if you are growing from seed until the plants are a fair size, when you can thin them out spread it between them.
I would put a sheet of polythene over the bed for a few days, then you will see the seedlings start to grow. They are very fast germinators so are encouraging. Another one is Nasturtium, not so fast, but has nice flowers, but likes to ramble. You can eat the flowers and leaves in salads.
One thing to remember is that the seeds interest in growing is greater than yours, so it's not hard to get a result.
Feed the soil not the plants. Avoid pointless expense like Miracle Grow, You can get a small plastic dustbin, drill a few holes in the bottom, or get one of those DAlek compost thingys, then put all your vegetable waste in it, torn up cardboard, toilet roll holders, shredded paper (not glossy), egg boxes. The worms will move in and make compost for you. Or watch the video
http://www.gardenorganic.org.uk/composting/index.php
).