How do I transfer my 35,000 iphotos to my icloud account. what is the best way to do that?

Do you have upgraded to MacOS X 10.10.3?

Then migrate your iPhoto Library to the new Photos.app for Mac and enable iCloud Photo Library, see this help page: https://help.apple.com/photos/mac/1.0/?lang=en#/phtfd130a7d7

To migrate your iPhoto Library to Photos, drag the library to the Photos icon in the Dock. Make a backup of the library, before you do that.

You will need additional free storage on the drive that is holding your iPhoto Library during the migration.

The drive with the library needs to be formatted MacOs Extended (Journaled).

So just so I understand, I should drag my photos under iphoto library to the photo icon in my doc?

You have to migrate your iPhoto Library as a library, not transfer the photos.

• Either drag the complete iPhoto Library package from your Pictures folder onto the Photos icon in the Dock
• Or hold down the alt/options key while launching the Photos.app by double clicking the icon and then select the iPhoto Library you want to upgrade to Photos in the Library Chooser panel that will appear. This will create a new Photos Library, that will look large, but will not need much additional space, because it will bestirring the photos with your iPhoto library.

See this link Photos saves disk space by sharing images with your iPhoto or Aperture libraries - Apple Support