If you want to self-host services, check out Yunohost. There you can install many different services like Vaultwarden as a password manager, Nextcloud for files, Blogging platforms, Mail services, ... You could use a Raspberry Pi as a server like i do. Otherwise, you could also use an old dekstop PC or some free VPS Best you can do with the domain is registering at cloudflare; there you have a lot of options to manage your domain.