Need help for feelthere ERJ145's database

Hi everybody. First thanks for all developers and informations we can found on this site !!!I've a problem with the navdata for my ERJ145. It's a wonderfull plane but I can't fly with all realism I guess.I downloaded the last airac (0509) and I can't find any SID or STAR and some waypoints are still missing. I'm certainly doing somthing wrong but I don't know what. I placed the new data in /nd folder with no result. I saw on certain sites .XML files for procedures for some airports, but I don't know how to use them. I tried to place them in different folders, but I changes nothing.PMDG procedures are quite easier to update, create, custom etc.... Isn't it possible to copy and paste them for using with ERJ145 ?Thanks for help !!!!!