1) First create an UX (user experience)

a) What is the experience?

b) Who are your users?

• personas
• market research

c) What do your users want?

• user stories
• customer journey

d) How are you going to give them what they want?

• communication design
• information design
• funnels design
• UI design

2) Second engineer the IA (information architecture)

What will you build?

• core product functionality (aka MVP)
• product features
• support features
• tooling

How does it work?

• software entities
• information flow
• database design
• application design

How will you build it?

• technology stack
• conventions

3) Third handle the PM (project management)

Who will do this?

• team assembly
• team management

What do we need?

• critical path
• resources
• budgeting
• effort allocation
• vendors

When will it be done?

• product roadmap
• product and work breakdown structure and/or backlog
• agile and/or waterfall procedures
• velocity and/or man-hours estimates