Hi Guys, Another startup is here

Hey Guys,
I m working with a startup. I am a SEO Manager(with just 1 year of experience..lol!)
So technically I need a number of advises, checklist, what to do or what not to do...
please help me for my website.
I want to make it perfect as all the other want to do, but don't know how to do it exactly!:(
Please tell me anything for improve my business website.