The image is the partition setup I am planning on using if it is appropriate.
It's up to you but you really only need 2 partitions for linux.
-One for your (/) EXT 4 Journaling file system approximately 20 GB
-And your swap partition 1 to 2 GB
First install your Windows os than shrink your windows partition
to about 249 GB (1/2 of your 500 GB HDD)
That will leave room for your linux installation.
Than proceed to install your Linux Mint os.
The new click BIOS are a little tricky. You'll have to go through the menu and first find the "uefi" and unselect it. Than find the "uefi + legacy" and set it to that. That worked for me with the new click MSI BIOS but....
--The new click BIOS are different--
What motherboard do you have? If your not sure run the lspci
command and it will be listed in the output.