Generate PDF Sales & Purchase Bills

I need two simple, ready-to-use PDF documents—one for a sales order and one for a purchase order. Each file must:

• auto-populate or leave clearly labeled fields for Customer details, an Itemized list of products or services, and all necessary Tax details
• follow a clean, professional layout that prints neatly on standard A4/Letter paper
• be editable in Adobe Acrobat or any free PDF editor so I can reuse it for future orders

I don’t have a fixed template, so feel free to create a straightforward design that focuses on clarity rather than heavy branding. A basic header with my company name and contact info, followed by well-spaced tables for the line items and totals, is perfectly fine.

Deliverables
1. Sales Order PDF template
2. Purchase Order PDF template
3. Brief instructions (one page or less) on how to edit the fields

This is a small-scope task; I simply need the functional files and a quick guide so I can start issuing bills right away.