I just bought a hosting plan, Now what ?

Geat! Now, first of all, you can upload your website content over FTP using any FTP client like Filezilla.
You have to upload your content in the public_html folder in Linux hosting.

If you have database support on your website then create a database from hosting control panel cPanel.

Then upload and restore database backup that you have on local PC. Now you can see your website live!