Q: Windows 10 on Macbook Pro

A 2011 Mac does not officially have Apple support for W10, so you will run into driver issues. Your 2011 model has a built-in Optical drive. USB boot causes issues on such models (2012 Macs are an exception). Burn your W10 64-bit ISO to a physical DVD and use BC Assistant to install Windows. Do not use a combined 32-bit/64-bti installer ISO.

Boot Camp Assistant. It should be in Applications -> Utilities.

Burn the ISO to a physical DVD.

The flash will be used to install BC drivers after Windows is fully installed.

If your ISO is smaller than 4.7GB, use a DVD-R Single Layer. If the ISO file is larger than 4.7Gb, post the file name. It should not be larger.

Please see OS X El Capitan: Burn CDs and DVDs and OS X El Capitan: If you have trouble burning discs. I normally right click on the ISO and use the Burn option from the pop-up menu. Make sure you expand the options and look at available details. It should look as...

willfalb wrote:

 

What do I do to download bootcamp  when I first start windows

BC Assistant is already on your Mac. BC Drivers can be downloaded using BC Assistant to a USB flash drive. They can also be downloaded using Apple Software Update on the Windows side. In your specific case, because 2011 does not have official drivers, you will need to install W7/W8.1 drivers from Install Windows 7 and earlier on your Mac using Boot Camp - Apple Support and use Administrative rights and compatibility mode to be W7/W8.1

how do I switch between Windows and OSX

Please see https://help.apple.com/bootcamp/controlpanel/5.1/ and Boot Camp: Set the default operating system .

The preferred route to get W10 on your model is to clean install W7/W8.1 on your Mac, which is fully supported. Once installed, run an in-place upgrade to get to W10.