Hi V.! I make baby food and I love it! I always feel like Martha Stewart after I make a big batch of veggie mush!
I have a book called SUPER BABY FOOD, by Ruth Yaron, and I highly recommend it. It's really easy for quick reference -you can look up any food and it will tell you what age is appropriate for your baby to start eating it and all the nutritional benefits of it. It also has a lot of information on how many servings of different foods your baby should be eating in a day and how much food is considered a serving. Serving sizes change as they get older.
You can start your baby out with mashed up avocados in his cereal. After a few days, introduce bananas. It's recommended that you wait 3-4 days before introducing a new food so that if your baby has an allergic reaction you can easily figure out what it was to. I use one of those hand held smoothie/blender thingies. Avocados and bananas are the only foods you can feed your baby raw, at this age.
Here's how you make baby food...
1) A lot of fruits and veggies have to be peeled first - like apples (cut the core out), squash and sweet potatoes.
2) Cut it up into cubes and toss it into a pot. I would do a lot at one time, like 5 apples or a butternut squash.
3) Cover with water and put a lid on it. Bring it to a boil and then turn it down to simmer until it is soft enough to mash. *Keep the liquid that's left over because you'll need it to thin out your baby food. Also, it has lots of vitamins from whatever you cooked in it.
4) Puree in a food processor or a blender, adding water until it's the consistency you want. It should be slightly thicker than breast milk/formula for a beginner and gradually thicker as your baby gets older.
5) Strain it. I used a large strainer with tiny openings and pushed the baby food through with a spatula. It doesn't take long if it's pureed enough.
6) Store it in the freezer. I filled ice cube trays and then once it's frozen put the cubes in a large freezer bag and marked it "Beans" or "Applesauce". This is really convenient because you can pull out one or more cubes at a time and let them set in the fridge overnight to thaw or put them in the microwave for a few seconds.
You can also mix different things together, like peas and carrots, or apples and squash. Babies don't care. They think it all tastes great!
For oatmeal, barley or rice (I prefer brown rice), I put 1/4 of it (dry) in the blender for 5 minutes, until it's powdery. While this is happening, I boil 1 cup of water. Add the grain to the water and turn it down to simmer for 10 minutes, stirring occasionally. This will make more than enough for one meal - so put the leftover in the fridge for the next day.
Sorry this is so long. I hope these tips help you!