Several experienced MODx members (aour, heliotrope, perinne, marc, myself) have advised you to first learn with a stable version, and learn the basics before asking multiple (not-so-precise) questions about the beta and advanced extension (I saw you were planning to use PHx, now that’s pretty advanced and useless if you don’t understand placeholders

).
Your last message doesn’t make much sense (or would require major pattern reconstructing which is ressource intensive and time consuming

). From your post in french, it’s not a matter of language skills (though english makes it worse, sorry).
Go back to 0.9.2.1 for the moment. Learn the basics. Ask one question at a time and possibly make that clear. Thanks !