Hello!

My first advice is that you read alot of the build threads on this forum. It will give you alot of advice!

The rail and bearing from banggood that you link to looks like what you want but go for two bearings per rail. And two rails per axis.
Some will argue that you want original parts (hiwin) and some will go for copies like you linked to.
Most come to the conclusion that next build will be built with hiwin :)

I have no clue about those roller bearings.
But I guess it all comes down to what you want to cut? And with what precision?

Good luck with your build and don't forget to read, ask and give us photos of progress :D

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