Don't know some words and don't have the translation

There are some words I don’t understand and the translator doesn’t have, and I don’t know any japanese, so I’m kinf of having problems… In the first line I have: 1 kara 20 made no kazu no kazoe-kata o benkyou shimasu, and I don’t know what it is or what it means: kazu, kazoe-kata, benkyou and shimasu.

I know it sounds pretty awfull and it is pretty embarrasing for me, but I really really want to learn!!

1 kara 20 made no kazu no kazoe-kata o benkyou shimasu
1 from 20 until 's number’s counting-way study do

I’m studying how to count from 1 to 20.

According to this text, I will translate “su” into “shoo”. It is possible to add “soredewa” at the beginning of this sentece.

1 kara 20 made no kazu no kazoe-kata o benkyou shimasu
=1 kara 20 made no kazu no kazoe-kata o benkyou shimashoo
=Soredewa, 1 kara 20 made no kazu no kazoe-kata o benkyou shimashoo

–>>Let’s study how to count from 1 to 20.

I think the narrator speaks a little bit carefully, but it seems a little fast for beginners to follow.