Here's a history of the different Mando'a scripts. Note that all appearances of the Mando'a scripts in official media use the script as a cipher for English with one exception (a few banners in Star Wars: Tales of the Old Republic have Mando'a in one of the Mando'a scripts): https://forum.mandoa.org/viewtopic.php?t=222 and with pictures: https://project-shereshoy.tumblr.com/post/668753830966657024/development-history-the-mandalorian-alphabet
Comparison of various versions that appear in the official media: https://project-shereshoy.tumblr.com/post/668602252638994433/this-chart-compares-the-most-popular-mandalorian
Here are examples of how people write using the Mando'a characters.
A few from non-Discord sources
https://www.tiktok.com/@motherofwerewolves/video/6916633152920308997
https://forum.mandoa.org/viewtopic.php?f=28&t=111 (page through to find the images)
https://www.reddit.com/r/Mandalorian/comments/kbr24h/i_wrote_a_poem_in_mandoa_i_know_thats_pretty/
https://www.tumblr.com/sootyships/779025740617383936/some-extremely-messy-mandoa-cursive-notes (check the reblogs for even more images, plus some discussion)
https://www.tumblr.com/sootyships/780019813231804416/mandoa-sort-of-like-writing-all-caps-ranahan
https://www.tumblr.com/mavlabajuri/779766079350259713/anything-can-be-cursive-if-you-try-hard-enough
https://www.tumblr.com/ranahan/714419668463517696/trying-to-figure-out-mandoa-handwriting-but
https://www.tumblr.com/ranahan/786955147693768704/re-mandoa-possibly-using-different-punctuation
Join the Mando’a Lessons server (find the link on the YouTube channel's "about" page); poke around for images or ask for samples when you get there: https://www.youtube.com/c/MandoaLessons/about
A few samples from Ba’jurir Mando’a (you will need to join the server to see them; https://discord.gg/NHBHce9Sw6)
https://discord.com/channels/792811531674714162/861331591858487306/863166903887331376
https://discord.com/channels/792811531674714162/861331591858487306/864223987717505044
https://discord.com/channels/792811531674714162/861331591858487306/890975851611570207
A sample of letters from the new Oyu'baat (you will need to join the server to see them; https://discord.gg/CPhU2YnvcU)
https://discord.com/channels/1047985847116501073/1047985849574379612/1095071503235694663
https://discord.com/channels/1047985847116501073/1047985849574379612/1427330880862556263
A few sample of letters from the Old Oyu'baat (you will need to join the server to see them; https://discord.gg/YRAEAxj)
https://discord.com/channels/325383927797907466/326021821704962059/770415099282063391
https://discord.com/channels/325383927797907466/468984697624723466/1043716369037926441
https://discord.com/channels/325383927797907466/468984697624723466/1043718944508346399 (originally done by Yatenari and reposted by someone else)
A sample of numbers from the new Oyu'baat (you will need to join the server to see them)
A sample of numbers from the Old Oyu'baat (you will need to join the server to see them)
Fonts
Font by Yatenari: https://fontstruct.com/fontstructions/show/1640934/textura-mandaloria
Font by Ashryll: https://fontstruct.com/fontstructions/show/299581/mandalorian_2
Mando AF Classic font by Galatic Surplus: https://galacticsurplus.co/blogs/news/mandalorian-font-free-download
Mando’a.org has a transcription program using two Erikstormtrooper fonts: http://mandoa.org/transcribe.html
MandoCreator has a transcription program with a choice of five different Mando'a fonts: https://mandocreator.com/tools/transcripticon.html
Version by Parjai Tracyn (includes first five are punctuation, next 10 are numbers, the slash is a question mark, letters follow that).