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Let's start with the numbers, these are generally easy to learn and are used often.

Number Japanese

1 ichi

2 ni

3 san

4 yon; shi

5 go

6 roku

7 nana; shichi

8 hachi

9 kyu; ku

10 ju

11 ju-ichi

12 ju-ni

13 ju-san
20 ni-ju

21 ni-ju-ichi
100 hyaku

200 ni-hyaku
1000 sen

2000 ni-sen

As you can see the numbers all follow a patternso that you should now be able to fill in thegaps in the list.
Good Luck!