You can check your hostname under Webmin > Networking > Network Configuration > Hostname and DNS Client. Unfortunately, some hosting companies overwrite this information every time a VPS is rebooted - you may need to contact them to get it changed. Choose a fully-qualified subdomain that you own, such as "webserver.mydomain.com" or "mail.mydomain.com". Do NOT accept a generic name provided by the hosting company if you will be sending email from the server because spam filters will block it and you can't easily generate SSL certificates for it.
Hostinger provides a 6-tier plan for their VPS hosting services, which you can choose to fit the needs of your website. Their Plan 1 offers the basic specs with 1,000 GB (aka 1TB) of bandwidth, 20 GB of disk space, and about 1 GB of RAMs. If you want more, you can opt for Plan 6 which gives you a whopping 8 GB of RAM, 160 GB of disk space and 6,000 GB of bandwidth.
All FastComet VPS hosting plans include many free features, such as application, module, and template installation and free daily/weekly backup and restore of your files, CDN, and web firewall. All of these features, combined with their high reliability and reasonable pricing is making FastComet one of the fastest growing hosting companies.
The most obvious and popular reason for a VPS is to run a single website, or multiple websites. However, you can use them for pretty much anything that requires access to the internet – such as a web application like Nextcloud to run your own Dropbox alternative – or to create your own virtual private network to better secure the internet connection of your PCs and mobile devices.