| Whooo boy.
OK, a domain is a logical grouping of Windows servers and workstations. Within that, the workstations do exactly that, but servers may fulfil one of two different roles; they're either members or domain controllers, the difference being that domain controllers validate logins and member servers don't. Each domain must have at least one domain controller (and I'd say at least two for comfort). The workstations and member servers each have their own local user accounts database, but can submit logins to the domain controllers for validation; the DCs ONLY have the domain accounts database, no individual user accounts databases.
Are you trying to join this server to an existing network or is it going to be doing its own thing? As I recall, SBS by default installs itself in a new domain as a domain controller. The horrible thing about SBS is that you can't join an SBS server to an existing domain; it insists on being the root of a new forest. Renaming an SBS domain isn't possible, so far as I am aware; it's different to Windows Server 2003.
Adding workstations is basically a question of having a user account in the domain with the "Add workstations to domain" security right assigned to them. Then at the workstation right click on My Computer, choose Computer Name, Change, click the radio button for domain, put in the domain name and click OK. You'll then be prompted for the user account which you can provide in the format <domain>\user, and the password. These should be for the account with the "Add workstation to domain" user right.
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