Hi, there -
Infants @ 6 months of age can start solid foods. Our ped recommends rice cereal first (for 3-5 days). Then, veggies, one at a time, each for 3-5 days. With our 2nd daughter, I did rice cereal for her @ 4 mos., then JUST started her on baby oatmeal 4 days ago. Tried peas for 4 days, did fine (also fine w/ oatmeal). Just this morning, I tried sweet potatoes. Do NOT give your baby juice or water. Infants under 12 mos are ONLY supposed to have breast milk or formula, because their bodies are NOT mature enough to break down juice in their little bodies yet. With my older daughter, I didn't give her any juice until about 13-14 mos., and when I did, I gave her 4 oz. max. That's all they really need.
Hope that helps, good luck!