You can use the Database Maintence Planner to do your regular backups and your log backups. It is pretty much the same design as the one in SQL 2000. Given your situation, I would just use this (and it will give you a full backup and a full transaction log backup) instead of trying to script one.
But if you want to script...
As far as the T-SQL commands go, it's mostly the same between the two versions. There are a few exeptions, but those are on the optional commands. Books Online can give you a better idea of what commands are supported. Even if you only have a copy of BOL for SQL2k, check out the Backup Database and Backup Log commands. It will tell you what commands are back-supported. Though, I think the major differences are between 7 & 6.x rather than 2k & 7...
Hope that helps.
Catadmin - MCDBA, MCSA
"If a person is Microsoft Certified, does that mean that Microsoft pays the bills for the funny white jackets that tie in the back???