In Japanese, Kanji is when reading starts to get really difficult ^^
The numbers are the simplest form of Kanji and very important so here they are~! Below is a video explaining the number, since I think I'll only confuse you guys if I tried. I think she did a good job of explaining it, but she didn't use the Kanji for the numbers.
It's a long video, you can skip to about 1:40 and she'll start teaching the numbers, you don't really need to know the numbers above 100 but she teaches past that if you want to know what they are. At about 16:50 she starts teaching how to count different things, like animals and people.
Below is all the stroke orders. When writing 2 and 3 be sure that stroke on the bottom is the longest. On 3, the shortest stroke is the one in the middle. If you have any questions just ask ^^