CM 13 and backup

I make backup by Huawei backup to my data call log , messages, apk and. Apk date how can me restore it after flash CM 13

And when try to install Gapps before CM ROM get error me need to know flash it after or before

I have CM in 22/7/2016 can me flash it and update or need to redownload it

Sorry for my bad English
Thanks a lot for help
KII-L21 EGY

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