I’ve met plenty of people that hear the flowery words of prayer from a pulpit or the intensity of emotion from desperate people and simply feel they don’t have anything to offer in prayer. They don’t even know where to begin.
For my money (which isn’t much) I think Petition is a great way to start out. It’s a simple request. It can be as routine as a “Lord be with me today” lifted up each morning, or a “O God, help!” when things have gone wrong. Then, over time, you might simply want to expand on those petitions…or not. That’s the beauty of petition; you just have to mean it and God fills in the rest.