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Hard drive.
Your old game saves will be on your old hard drive/ memory unit. If they are on a memory unit then it is a simple issue of plugging the memory unit into the new xbox and copying the old save to the new hard drive. If you have an old hard drive you can plug the old hard drive into the new xbox and play from there. If you want to transfer the saved games from the old hard drive to the new hard drive you need a hard drive transfer cable and follow the instruction to transfer the data from the old hard drive to the new one.
You do need a hard drive to download expansions, but the system won't turn on if you don't have a hard drive, so if you can turn it on without problems, and can play games then you definitely have a hard drive and you are able to download expansions.
The hard drive just pulls away from the top of the console
The wii has no built in hard drive, however there are people who have modded the machine to use a hard drive. The technical aspect of that however makes it very challenging.