@Raj_Malik there is nothing like complicated.
If you purchased web hosting so there are few considerable things to do, which are listed below.
Setup your hosting service name servers with domain to connect both of them to each other.
Another one thing, create primary domain email (i.e. email@example.com) to accomplish administration purpose and needs.
Make sure that, is there any backup tool exist with your current hosting plan otherwise purchase backup tools separately because it is an obligatory step and responsibility of server administrator.
Now you may go ahead to start your website building process. Keep remember that, if you purchased SSL security layer then please install it before starting website journey. (Recommendation)