Dell dss 2500

I want to customize my server with basic server components and without a server chassis. 

I have these things in stock:-

1) Dell DSS 2500 motherboard

2) 2 x intel xeon e5-2650v4

3) 8 x 32 GB ECC RAM

4) 2 x 2 TB HDD SATA

5) 2 x Dell 450-watt power supply

6) 2 x Dell 750-watt power supply

7) 6 x server fan

I have connected the following things to the server, but when I start it, it gets stuck at the BIOS. Please check the photo or video.

1) Dell DSS 2500 motherboard

2) 2 x intel xeon e5-2650v4

3) 8 x 32 GB ECC RAM

4) 2 x 2 TB HDD SATA

5) 2 x Dell 450-watt power supply

6) 6 x server fan

7) Connected both HDD Sata drives with onboard raid controller card with wire  { mini SAS (SFF-8087) TO 4X SATA forward break out cable }

I have questions to ask:-

1) What are the basic components required to run an operating system?

2) Do I require IDrac 8 physical card, front control panel, back panel, raiser card and HDD back panel