You may google to find more strums, and there are a few 'usual' ones that are used. However when it comes to strums, feel free to ad-lib and invent your own!
One of the most important things about strumming is to keep it in time. Playing a ukulele often has no drum to accompany, and the strum can easily make up and replace that.
Strums are usually noted as a / for a down strum. You may see a song which has a / / / / above the words, meaning just 4 straight strums. More commonly you will see them written down as D for Down, and U for Up.
Here are a few more common ones.
If you check YouTube , you can often see and hear different strums, practice and replicate. You will no doubt find "your" strum, but be wary of getting stuck on the one strum!
Here are a couple more interesting strums.
Next -> Step 7 - Arpeggio