Hi, ChubRub.
Internation Rumba is danced with the QQ on a different part of the music then American.
Start by sitting and listening to a rumba song and being able to hear the "1" beat. Count 1,2,3,4 and practice starting and stopping counting out loud and being able to find the 1.
Listen for boom, tick, boom, tick. The "boom" or down beat is heard on beats 1 and 3. The "tick" or upbeat is 2 and 4.
Your quick quick is now to be danced to beats 2, 3. The side step will take up beats 4 through 1.
I do lots of social dancing and I see many people doing International Rumba, but maybe 5% of them dance it to the correct timing of breaking on the 2 beat.
I danced with a nice fellow recently who realized partway into the song that he was off time in Rumba, so he started counting out loud "Tick-tock- 4-1 Tick-tock-4-1" and that seemed to work for him.
Incidentally, this is also where you should be breaking in Cha cha - on the 2/3 beat, so if you have correct timing in cha cha, perhaps that may help you.
+Jewel B.