Although there is no such thing as a “Premium Steam Account”, I would assume that you need an account that has access to community features, such as adding friends and chatting on forums.

In this case, you will have to spend at least $ 5 on the Steam store.

Here is a link for more information about restricted user accounts

In fact, the guys who run Steam realized that spammers, phishers and other malicious users are using "fictitious" accounts without any money spent on them to harass or steal from legitimate users. By putting most of the community features behind a small paid wall, you pretty much shut down 99% of these fake accounts.