How Make Complete/Custom Tax Details On Packaging Slip And On Invoice ?

[srihar]

I want few details to be reflected on my invoice and packaging slip as mandatory things followed by other existing details too.

1) Legal Registered Business Name
2) GST Number/Tax Number
3) HSN Code of Product (Harmonized System of Nomenclature)
4) Legal Registered Business Address
5) Legal Registered Contact Number

Can anyone provide code for this ? and guide step by step details to implement it ?