Installation :: Partition Strategy For Clean Install?

I am building a new computer next weekend and have three drives and need partitioning strategy for 3 drives:

- Drive 1: New 256GB SSD m.2 pci-e SSD for Win10 and apps (autocad, sketchup, Adobe CC, rendering apps)

- Drive 2: Old 2010 Vertex SSD which is 90-120gb (can't recall) for scratch disk/win page file for Adobe and apps

- Drive 3: New HGST 7200rpm 4TB 3.5" HDD for files, pics, video and possible system image ( necessary on Win10?)

1) I plan to format all 3 drives as NTFS unless there is strong suggestion to do otherwise?

2) what is best partition strategy for Drive 1? How much GBs for partitions for Win vs Apps? Is 60GB adequate for win10 partition leaving just under 200 GB for apps?

3) I read on win website to create 3 partitions for sys in this order: utilities; sys; win recovery. Does default win setup do this automatically or must I specify how many partitions and in what order and in what size? I'm clueless on this.

4) Disk 2: how much risk am I taking by using 5 yr old SSD for scratch disk? The virtual memory is volatile anyway so am I just risking each current session? I plan to point page file, cache, scratch to this drive. If too risky, I presume that using boot SSD as scratch is better than using HDD #3?

5) Disk 3: does win10 still require that user do image of opsys for recovery (using acronis et al) and, if so, how many GBs do I partition on Disk 3 and if so does it matter if it is the first or last partition on this drive 3?

6) what win 10 should I get? At Fry's they have OEM and also USB flash drive?