How to install the new OS X

Hello guys ..
I know that if i download the new software from the app store i can install it on my macbook air easily .. What i don't know is how to delete the previous OS (i want a install) and when i finish installing the new OS, how do i recover all my data from timemachine !!
If you can give me the step-by-step instruction it will be perfect..
I don't want to loose my photos, music and data file, word files etc. Are those files saved in time machine as well ?

I personally don't do that, even with Mac OS X, but other seem to find it works OK.
If you chose to first erase the drive during the first part of the new OS install then instal the new OS to a Clean drive if you have made the compplete system backup as I suggested you can use the Setup assistant system to copy over Programs, Settings and Personal files from that backup you made just before you started the process.
Biochemist69 wrote:
is it good to over write the existing OS ? i think its better if i delete everything and then install the new OS. I might be wrong .. what you think ?

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