Starting project managemnt project from scratch with no prior experience

So i have been tasked to create an app using agile method but as a beginner with no prior expereince in project management . Whats the wall to avoid when starting out . Mainly in creating an app for a business . Whats your thoughts on this fellow Gurus and mentors . I have been doing user stories and what tasks and sprint i should focus on but i dont know if i am doing it right