I am selling my iMac 2006 and have erased the hard drive - re installing OS Snow Leopard from a retail disc I bought when I upgraded. Now I realise I have probably erased all the software that came with it originally e.g. ilife. I have a Time Machine backup - but I'm not sure whether or how I can use it to reinstall the applications. Would love some help if anyone can tell me please?
Short answer, yes you can restore applications from TB backups as I have done this on my very own Macs when upgrading to Yosemite.
Applications like iLife are bound to your Apple ID so you should be able to download then from the store, I believe.