I NeeD HeLp PLease AM882 a good choise

[Jonathan]

I have a couple of questions regarding the hgr15 for the x axis, maybe they will work or will I need a hgr20?

Either is plenty stiff enough. Sometimes people go for the 20mm rails just to make it easier to to make the parts they mount to with minimal machining. You need to draw it and work out which is best before buying them.

Motors
5PCS Nema 23 stepper motor 425oz-in,3A,2ph,1.8° CNC Engrave 241uss

Don't get those. They're 3A/phase which means they're the higher inductance motors. You want motors with lower inductance to get more torque at higher speeds - just search this on the forum and you'll find more detailed explanations. Last time I checked, these were the best value.

Timming Belts?
Witch timing belts and pulleys do you recommend?

HTD 5m (i.e. 5mm pitch) and 15mm belt width. Don't get bigger pulleys than you need to as it'll adversely affect the acceleration. You can get them from Bearing Station, belting online or aliexpress.

Drivers and supply power?
I have the same problem as before, I believe that you can help me with this. I have researched on these products, what do you think? Is it an analogic driver convenient or a digital one?

The 'digital' ones should be better than the 'analogue' ones, but it's a bit of a misnomer as they're all digital to an extent. Drivers like the AM882 use better algorithms (e.g. field oriented control) to get slightly higher torque from the motors and detect stalling, among other things. However once you've tuned the system properly it wont stall, so if you can get enough torque with a cheaper driver (e.g. DQ860MA) I see no reason to get the better ones.