When you are "planning on" doing something, it means that you intend to do it. You want to do it. But it doesn't necessarily mean that you have a strong plan for getting it done. For example, you can say:
I'm planning on throwing a big party for Kevin's 30th birthday in November.
If you say this in May, it doesn't mean that you've planned out a party. It just means that you think you're going to do it.