What setting it up properly involves
Anyone can create a mailbox. These are the decisions that make it hold up.
Your domain, verified and pointed correctly
Workspace only takes your domain once you prove you own it, which means a DNS record. Then the MX records have to point mail at Google rather than wherever they pointed before. If your DNS is somewhere you can reach, this is quick. If nobody knows who controls it, that is the first job, and it is one we meet constantly: see DNS and Cloudflare.
The shape of the accounts
Worth thinking about for a few minutes at the start, because it is tedious to unpick later. People get accounts. Role addresses like info, sales or accounts do not need to be accounts: they can be aliases that land in a real inbox, or groups that reach several people at once. That way a role address does not vanish when a person leaves, and you are not paying for a mailbox that is really just a label.
Admin that belongs to the business
The administrator account should belong to the company, not to whoever happened to sign up, and not to a contractor. This sounds like paperwork until the day someone leaves on bad terms and takes the keys to your mail with them. We have untangled that situation. It is expensive and it is entirely avoidable.
Authentication, so your mail is believed
SPF says which servers may send as your domain. DKIM signs your mail so it can be verified as genuinely yours. DMARC tells receiving servers what to do when something claiming to be you fails those checks. Skip them and your mail is a stranger asking to be trusted. Set them up at the start and you never think about it again.
The rest of the suite, if you want it
Drive for shared files, shared calendars, and the collaborative documents. Most small businesses use a fraction of this and that is fine. The bit worth doing deliberately is shared storage, because "the file is on Dave's laptop" is a business risk that presents itself as a filing habit.