The 8100 does not work with that z270 motherboard. The z270 motherboard will only work with a 6th or 7th gen Intel CPU. You will either need to get a new CPU, or get a b310/b360/z370/z390 mobo.
For the 8100 I would go with this motherboard.
PCPartPicker part list:
https://pcpartpicker.com/list/KcYGGG
Price breakdown by merchant: https://pcpartpicker.com/list/KcYGGG/by_merchant/
Motherboard: Gigabyte - B360M DS3H Micro ATX LGA1151 Motherboard ($69.99 @ Amazon)
Total: $69.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-01-03 08:51 EST-0500