There're a few threads around with this topic. You might want to surf around for it.
Normally it is recommended to introduce solids at 6 mths of age. The purpose of introducing solids at that time is more to get baby accustomed to getting food off a spoon. For some, introducing them to solids is a breeze but for some, they may be facing some resistance.
You might want to go shopping for a bowl as well as a spoon suitable for weaning. Then consider what solids you want to start with. Most mums start with cereal like Healthy Times.