First time builder

[Gen.MIDI]

Here is the buy plan.

ASUS Prime Z390-A HDMI, SATA III, USB 3.1 ATX Motherboard
https://www.newegg.com/Product/Product.aspx?Item=N82E16813119152

Intel i7-9700K Coffee Lake w/UHD Graphics 630 Processor (BX80684I79700K)
https://www.newegg.com/Product/Product.aspx?Item=N82E16819117958

Gigabyte Radeon RX 5700 XT

GIGABYTE Radeon RX 5600 XT Video Card GV-R56XTGAMING OC-6GD rev. 2.0 - Newegg.com

Buy GIGABYTE Radeon RX 5600 XT 6GB GDDR6 PCI Express 4.0 x16 ATX Video Card GV-R56XTGAMING OC-6GD rev. 2.0 with fast shipping and top-rated customer service. Once you know, you Newegg!

www.newegg.com

SAMSUNG 860 EVO Series 500GB drive x2

SAMSUNG 860 EVO Series 2.5" 500GB SATA III V-NAND 3-bit MLC Internal Solid State Drive (SSD) MZ-76E500B/AM - Newegg.com

Buy SAMSUNG 860 EVO Series 2.5" 500GB SATA III V-NAND 3-bit MLC Internal Solid State Drive (SSD) MZ-76E500B/AM with fast shipping and top-rated customer service. Once you know, you Newegg!

www.newegg.com

32 Gig RAM

G.SKILL Ripjaws V Series 32GB DDR4 3200 RAM Memory - Newegg.com

Buy G.SKILL Ripjaws V Series 32GB (2 x 16GB) 288-Pin PC RAM DDR4 3200 (PC4 25600) Desktop Memory Model F4-3200C16D-32GVK with fast shipping and top-rated customer service. Once you know, you Newegg!

www.newegg.com

So that is what I'm planning on buying. I have case, power and a monitor. I do need this system to also boot to Windows which I plan to get and running first. Nervous about the whole thing. Any last minute advice before I buy?

 

[antieatingactivist]

Looks good. You are doing the right thing buy using 2 separate SSD's for dual booting. The only think I might suggest is swapping one of your SATA SSDs with an NVMe SSD. You have the slot, you might as well enjoy some extra speed.

 

[Jamesbond007]

Here is the buy plan.

ASUS Prime Z390-A HDMI, SATA III, USB 3.1 ATX Motherboard
https://www.newegg.com/Product/Product.aspx?Item=N82E16813119152

Intel i7-9700K Coffee Lake w/UHD Graphics 630 Processor (BX80684I79700K)
https://www.newegg.com/Product/Product.aspx?Item=N82E16819117958

Gigabyte Radeon RX 5700 XT

GIGABYTE Radeon RX 5600 XT Video Card GV-R56XTGAMING OC-6GD rev. 2.0 - Newegg.com

Buy GIGABYTE Radeon RX 5600 XT 6GB GDDR6 PCI Express 4.0 x16 ATX Video Card GV-R56XTGAMING OC-6GD rev. 2.0 with fast shipping and top-rated customer service. Once you know, you Newegg!

www.newegg.com

SAMSUNG 860 EVO Series 500GB drive x2

SAMSUNG 860 EVO Series 2.5" 500GB SATA III V-NAND 3-bit MLC Internal Solid State Drive (SSD) MZ-76E500B/AM - Newegg.com

Buy SAMSUNG 860 EVO Series 2.5" 500GB SATA III V-NAND 3-bit MLC Internal Solid State Drive (SSD) MZ-76E500B/AM with fast shipping and top-rated customer service. Once you know, you Newegg!

www.newegg.com

32 Gig RAM

G.SKILL Ripjaws V Series 32GB DDR4 3200 RAM Memory - Newegg.com

Buy G.SKILL Ripjaws V Series 32GB (2 x 16GB) 288-Pin PC RAM DDR4 3200 (PC4 25600) Desktop Memory Model F4-3200C16D-32GVK with fast shipping and top-rated customer service. Once you know, you Newegg!

www.newegg.com

So that is what I'm planning on buying. I have case, power and a monitor. I do need this system to also boot to Windows which I plan to get and running first. Nervous about the whole thing. Any last minute advice before I buy?

This build should be compatible with MacOS Catalina (but not older versions because of the 5700 XT).

 

[JBX]

Get the EVO+ NVMe 500GB currently price dropped from $120 to $100USD. The price on RAM is just a few bucks more for the 3600/28800 CL16. Check MicroCenter.