Although numbers aren't used much in written language, they are very important in communicating prices, times, gate numers, bus numbers etc. Therefore, it is essential that you learn them. Try learning them in chunks of ten to make it easoer and make flashcards or play spanish bingo with friends.
Here are number 0-20
Dont forget that in spanish, you roll your r's :)
0 cero th-ero
1 uno oo-no
2 dos doh-ss
3 tres tre-ss
4 quatro qu-aat-ro
5 cinco think-o
6 seis says
7 siete see-et-ey
8 ocho o-cho
9 nueve nu-e-vay
10 diez di-eth
11 once on-thay
12 doce doh-thay
13 trece tre-thay
14 catorce cat-or-thay
15 quince keen-thay
16 dieciseis di-ethi-says
17 diecisiete di-ethi-see-et-ay
18 dieciocho di-ethi-o-cho
19 diecinueve di-ethi-nu-e-vay
20 veinte bayn-thee.