Hello Vasilka,
great that you would like to participate. please have a look on our project
site: http://commons.wikimedia.org/wiki/Wiki_Loves_Monuments_2012.
Of special interest might be the information on lists and uploading.
http://commons.wikimedia.org/wiki/Commons:Wiki_Loves_Monuments_upload
Welcome Vasilka and good luck with organizing WLM in Macedonia.
The schedule might be a little tight to participate this year, but if you hurry
a bit, you might make it. If not, the good news is that you'll have plently of
time to prepare for next year's contest.
Regards,
Andrei