UX for MVP

Hi, I am working on a MVP iOS and Android app and would like to get early version out in about 10 days from now. This is to get it hands of potential users in 3 weeks from now.

I haven’t built UI stuff before so I am bit concerned of initial UX and how it will impact my early adopters..

Any suggestions / resources to follow some basic guidelines so that it’s not too shabby UX wise would be greatly helpful