Beginner question: how should I structure a lead follow-up workflow in n8n?

I’m new to n8n and trying to learn by building a simple real-world workflow.

Use case: when a new lead/form submission comes in, I want n8n to:

1. save the lead to Google Sheets or a CRM
2. send an email confirmation to the lead
3. notify me in Slack/email
4. create a follow-up task if they do not book a call
5. log errors somewhere so I know if the workflow breaks

For someone just starting, what would be the cleanest way to structure this workflow in n8n?

I’m especially unsure about:

• whether to use webhooks or form integrations
• how to handle duplicate leads
• where to keep logs
• how to set up retry/error handling
• what parts should stay manual instead of fully automated

Any example workflow structure or beginner advice would help.