My very own WebOS

I currently am working on a drawing app! I am very bad a coding so bear with me here. I'm not exactly sure how this site tracks time, but I've worked on this for well over an hour. Maybe around and hour and a half. Anyway! I've finished most of the design, I'll eventually add more and I have coded most of the buttons. I'm not exactly sure how to fix the fact that my app thing starts off on the last page, however, after a minute it should redirect to the starting page. I'm also not sure how to make sure the "paint brush" only works when you press on your mouse and drag rather than just drag your mouse. Hopefully I'll be able to figure that out soon. Some more additions I'm hoping to add: Touchscreen because so far I only have keypad/mouse. I do have colors and a size slider so far, but if you have any suggestions and a rough idea on how to do so PLEASE tell me so. Thank you!!