Just did an article on how to create a full blown cowbell windows mobile professional application over at Coding4Fun. Shows how to do pInvoke calls, touch screen, image resizing (in source, not in article), resource embedding, creation and deployment.
Read the article out and play with the source code. Also if you want some other windows mobile intro level topics, I have a tag called “Getting Started with Windows Mobile” that has everything I’ve learned step by step.