Partition question, and Help with procedures for Dual-boot Win10/Mint on a new Drive?

A friend just gave me his i7 Lenovo IdeaPad 710S.(Current Specs Below) I want to make it a Dual-boot Win/Linux machine.

I'm starting with a NEW SAMSUNG 970 EVO Plus SSD 500GB - M.2 NVMe.

I'm thinking I need 4 partitions. Two for Windows, OS and Win files (NTFS) and two for Linux Mint, OS and files.(EXT) Is this correct? Any hought on partition sizes? I'd also appreciate any suggestions for the formatting/install procedures, and good partition software, etc. Is most partition software capable of Windows NTFS and Linux EXT?

Most research says to get Windows installed first, before adding Linux.

Processor
Intel Core i7-6560U 2 x 2.2 - 3.2 GHz (Intel Core i7)
Graphics adapter
Intel Iris Graphics 540, Core: 1050 MHz, shared Memory, 20.19.15.4364
Memory
8192 MB , LPDDR3, 1866 MHz, Dual-Channel, soldered
Display
13.30 inch 16:9, 1920 x 1080 pixel 166 PPI, Sharp SHP 1447 / LQ133M1JW15, IPS, glossy: no
Mainboard
Intel Skylake-U Premium PCH
Storage
Samsung PM951 NVMe MZVLV256, 256 GB
Weight
1.16 kg ( = 40.92 oz / 2.56 pounds), Power Supply: 170 g ( = 6 oz / 0.37 pound