the process is free of charge so far... the payment will be only at the interview and the medical exams !, any website tells you that you must pay and blah blah, that's a fraud !
cuz the official website's extension is like this ".gov" any other sites like ".org or .com or . info etc." are not official governmental websites, so step away from 'em
current case number means, that your case number is now in progress to put it in a schedule for an interview after couple of months later, and that happens after corresponding to KCC (sending back the printout applications and photos and the barcode sheet)...
so, if your case number is lower, that means the processing for an interview will be earlier...
good luck