Pangrams for fingerspelling practice:

A pangram is a sentence that uses every letter of the alphabet at least once.

Prior to going to ASL "socials" (such as a "Deaf Coffee Social) ASL learners should practice fingerspelling until they can spell:
"The quick brown fox jumped over the lazy dogs" smoothly and clearly in under 15 seconds. That sentence has all of the letters of the alphabet.

Here are a few more practice sentences* that contain each letter of the American English alphabet at least once:

"Jived fox nymph grabs quick waltz." (28 letters)

"Glib jocks quiz nymph to vex dwarf." (28 letters)

"Sphinx of black quartz, judge my vow." (29 letters)

"How vexingly quick daft zebras jump!" (30 letters)

"The five boxing wizards jump quickly." (31 letters)

"Pack my box with five dozen liquor jugs." (32 letters)

Goal: Try to get to the point where you can do ALL six in under one minute.

Test: Video record yourself spelling all six of those sentences in under a minute. THEN show the video to a friend who knows fingerspelling and ask them to type out what you have spelled. They can stop and rewind if needed. If they can figure out every word you spelled (without doing an internet search or any other form of "assistance) -- then you have spelled clearly enough and succeeded in the test.
 



 

Notes: 
* The above pangrams were listed on the Wikipedia "pangram" page.