Do I need thermal pase? First time pc build.

[Optimized Robotics]

I've never built a PC before and don't know if I'll need paste or not. Also, what do you think of my components?

Intel Core i5-6500 Skylake Processor 3.2GHz 8.0GT/s 6MB LGA 1151 CPU
MSI B150 PC MATE LGA1151/ Intel B150/ DDR4/ 2-Way CrossFireX/ SATA3&USB3.1/ M.2&SATA Express/ A&GbE/
Seagate Barracuda ST1000DM003 1TB 7200RPM SATA3/SATA 6.0 GB/s 64MB Hard Drive
ASUS STRIX R9 390
G.SKILL 8GB (2 x 4GB) Ripjaws V Series DDR4 PC4-17000
FirePower ZT Series 550W 80Plus Bronze Fully-Modular High Performance ATX PC Power Supply
Phanteks Enthoo Pro Full Tower

 

[bystander]

Your HSF should come with some form of thermal compound. It isn't likely a paste, but it could be.