I would recommend you start with the following Help link that should put you on the correct track:
https://help.qlik.com/en-US/qlikview/April2020/Subsystems/Client/Content/QV_QlikView/Loading_data.ht...
Be sure to check out the following subtopic too:
https://help.qlik.com/en-US/qlikview/April2020/Subsystems/Client/Content/QV_QlikView/LoadData/best-p...
And when developing the visualizations, I would review the following too:
https://help.qlik.com/en-US/qlikview/April2020/Subsystems/Client/Content/QV_QlikView/application-per...
Regards,
Brett
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