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May I ask how exactly they are "out of order" and what that means?
I will be standing by, looking forward to your response.
Are you restoring them from an iPhoto Library? If not, how are you doing so?
Are the images themselves time-stamped or was that done in iPhoto?
Please, look at the Collections/Moments section. Are the photos in order there?
That is in the Photos app.
Most of them are in order, but a few are not?
I have run out of ideas.
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Did you transfer the Photos Library from your Pictures folder exactly as it was, intact? What did you put on the flash drive to transfer and how did you do it exactly?
You can organize them into albums but you cannot change the dates associated with them. If you transferred it correctly those dates should all be transferred which is why I asked how your transferred the library.... to authorize your computer go to Account / Authorizations / Authorize this computer in iTunes
Yes but if you transferred your Photos Library correctly you wouldn't have to do any of that. The easiest way to transfer EVERYTHING is to get a Time Machine backup of your old system then just transfer the whole thing using the Migration Assistant.
You can transfer your iTunes Library manually too both methods are described here: https://support.apple.com/en-us/HT204318
I can help you by remote too if you wish.
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If you deauthorize all that will not lose any of your music it just resets the authorizations on all devices and they must be reauthorized.