Preparing Mac for resale

I have purchased a new Mac Mini and I want to sell the old one.  I will migrate the documents I want to bring over and delete all personal documents on the old Mac.  It is running OS 10.6.8 (Snow Leopard) because I use MS Office 2004 and it requires Rosetta to run.  Subsequent versions of Mac OS do not support Rosetta so I plan to resell it with OS 10.6.8 and MS Office and other applications. 
After I delete personal documents (including photos, emails, etc.) on the old Mac, is there a way to safely erase the remaining free space?  Also is there a program that I can run tom tell me which applications require Rosetta so that I don't bring them over?    Any other advice on carrying out this transfer would be appreciated.  I have learned that the quickest way to transfer files is via an Ethernet connection between the two machines with the old Mac started as the source disk.

I was just testing a Mac Mini that I bought from eBay and which needed to be returned. The drive was in such bad shape that a one pass zero or secure erase of any kind would never have made it. Instead, since I had no personally identifiable information on that machine, I just deleted the user I had been testing with from Users & Groups (Accounts in Snow Leopard). It came installed with Yosemite, so not sure if this option is available in Snow, but I deleted that user with the option secure delete. It happened almost instantly, so not sure what secure delete for an account actually does, since it would have needed a bit of time at least to write zeros to that account, even with hardly anything there. Plus, although I have Snow, I have never needed to use that option in Snow, if it's even available there.
So a long winded reply to say that I just don't know how secure a "secure" delete of a user account is. I wasn't that bothered because, as I already said, I hadn't put any personally identifiable information on that machine. I did however want to be sure it securely deleted my wireless router password in Keychain. Didn't want to leave that lying around to be recovered, even on a drive that was about to die completely. So I hope it nuked that securely, which shouldn't have taken much time.
Maybe someone else here will know just what a secure delete of an account actually involves. If it does some kind of overwriting with zeros or random zeros and ones, or what the "secure" in secure delete really means. Actually, it's called “Erase home folder securely.”
Apple doesn't provide much more information than this:
https://support.apple.com/kb/PH10754?locale=en_US
Here, someone is saying it does a 35 pass overwrite.(Makes me wonder then, if when I did it, it really did that). I hope that drive dies completely and very soon.
http://apple.stackexchange.com/questions/30639/issue-with-deleting-user-account

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