Wanting to create a geospatial data portal - how to start?

[RobertaDonaldson]

I have to create a geospatial portal using ESRI Online where a user can draw a polygon and the application will find layers (restraints) that intersect. This is for developing - i am in the environmental consulting field - so that the user can see what constraints or permits they need in order to place something on that land. Any suggestions on how to start? Would this be something I could get done all on ArcGIS Online???

[KellyGerrow]

Do you need a tool to do this or an interactive web application?

[RobertaDonaldson]

An interactive web application is the goal. We do not have Business Analyst and we want to be able to use our own data along with various public data. 

[KellyGerrow]

If you already have your data, try creating the new zone look up app:

https://www.esri.com/arcgis-blog/products/arcgis-online/mapping/introducing-zone-lookup/