[oceanician]

I'd write down several simple features that the web application will need to do.

Then put them into Trello.

Then prioritise which ones are the most valuable to the business.

Then try and code those first.

Perhaps at this point, try and break that 1st task down into 3 or 4 subtasks.

Write a checklist of every little detail that the pages should have.

As you do even the smallest of things, tick of that element in the checklist.

Ask questions to those that your working for.

Make suggestions for improvement if you notice them, but understand that their maybe genuine business / user reasons for some oddities you'll find.

[oceanician]

Also make sure you someone from the business who'se interested in the project. Make them interested if needs be i.e. find out what pain points they experienced with the old app, and have a think about what you can do together to improve that area of functionality.

Together write a regular report to the rest of the business about what's happening, and give a fortnightly update.