Store Backend Management

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I have a pharmacy online store on the Shopify platform, however, I am just not able to manage the backend inventory management ie

purchase entry as per distributors. (rate checking)
2 debit note credit note
3 tax filing
4 rate comparison salt wise (to be displayed on the front end too)
5 bulk web messaging
6 sales return
7 rate correction
8 barcode printing (including in purchase entry(
To display distributors' name date invoice no. Expiry date and location)
9 sales 
10 payments
11-day book 
Can you please guide me on how can I get this in place
Please advise.
Best Regards