ok,well you'll be in your cycle,and i hope that your fish will be ok.
guppies are not the best to start with.
do you have any friends near to you with fish ?
if you do ask them if they would donate something from their filter,
that you could put into yours.
the readings that you'll want will be Amonia 0 nitrite 0 nitrate 10-20 under 40
probably in about another 3 weeks,if you are unable to get something donated.
i would say water changes will help the fish get through it,don't touch the filter
to clean it at all,leave it to build up all the bacteria that it needs.