Hey evgeny2222 - I’d wait until your company is set up because you require company numbers and tax information when going through the submission process on the Epic side. It should be relatively straightforward to get the company numbers in place - I’m not sure what country you’re in but in the UK it’s quite an easy process.
It’s great you’re wanting to get your Coming Soon page up early so you’re taking the right steps, I’d just set the business-side work up in parallel to your development so you have that in place ready for your announcement.
Good luck!