Help Required for a contacts App

I am making an app after such long time, I have almost forgot everything, consider me a newbie. the details are as so
I have finished designing, and other parts, but stuck on one thing only
this screen has three text boxes, and one search button, I want the user to type name, district and designation in the given three boxes, the district and designation boxes shall be drop down menus. upon pressing the search button I want the app to show relevant contact from the google sheet where I already have saved contacts of the employees of my organization, pleased guide me with the blocks section, I am totally blank, also help me attach the google excel sheet with the app also.

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Simple method is, just use gviz method of query
METRIC RAT AI2 - Use gviz to get and query google sheet data thanks to @TimAi2