Install dropbox.com or box.com on your ipad.
Create dropbox.com or box.com etc. account.
Goto library, etc.
Upload files to your account. You may need to upload one file at a time. On a computer you can download and install apps, you will be able to create a dropbox/ box folder and copy all your files there.
Files will sync to your ipad.
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I bet if you want to an apple store, they would help you out. Make an appoint with a "genius." At one time, you could install app on the macs at the apple store.
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iFlash Drive
Here is a nice adapter. You can move data in both directions! Be sure to get the real thing.
http://www.photofast.tw/products.asp?pid=132
review:
http://www.macworld.com/article/2036911/review-i-flashdrive-hd-a-flash-drive-for -ipads-iphones-and-laptops.html
Here is the ios app:
https://itunes.apple.com/us/app/i-flashdrive-hd/id525386291?mt=8
The app get some bad reviews. Turns out there is a cheap imitation product that didn't develop their own software and parasites of of PhotoFast's software. Could be the folks using the imitation product are complaining.
Airstash
"Easily access, transfer, and stream your files from AirStash® – the pocketable wireless flash drive for iPad, iPhone, and iPod touch! This app requires an AirStash device in order to work. View, import & export photos, wirelessly stream videos, music & podcasts, and view documents stored on your AirStash. AirStash+ is an enhanced alternative to the built-in web interface adding features only possible with a native app."
http://www.airstash.com/