German consultant

We're looking for a German native-speaker who was born and lives in German to help us with:

1. Explain to us a bit more about German culture, traditions, what are they vibing with

2. Tell us more about payment gateways in Germany (which ones are predominant, how to get them etc.)

3. Are German people used to pay for shipping, or they rather choose free shipping as an option?

4. What products are German people predominantly buying? Is it clothing, gadgets, home & kitchen utensils, health & beauty products?

5. Go through our whole website and tell us about potential flaws:

5.1. Home page
5.2. Product page
5.3. Cart page
5.4. Checkout page
5.5. Proofreading few policy pages on the store + few product pages.