Hello Vince,
Brian here from the Shopify Guru Team. :) I hope the week is treating you well.
Although our guru team aren't able to support app development or API related issues, we do actually have some wonderful online resouces that will help get you on your way to creating the next awesome Shopify app.
To begin with, I would strongly suggest taking a look at our Shopify Doc on how to create an app. This will take you through the process of getting yourself set up to start making the app, and even gives you information on how you can get the app listed on our App store. You can find this doc here: https://docs.shopify.com/api/introduction/getting-started#create-app
Along with this, you will certainly need our API documentation, which will help you find out what information your app can call up and how it may be achieved: https://docs.shopify.com/api
Next up we have our Shopify API & Technology forum, where other app creators and merchants making use of the API will discuss topics and provide a helping hand when they can: https://ecommerce.shopify.com/c/shopify-apis-and-technology
Similarly, there is the Shopify StackOverflow hub where more questions can be asked, and answered hopefully found: http://stackoverflow.com/questions/tagged/shopify
Hopefully these will help you take your first steps into Shopify app development. :)
Have a lovely day!