First of all, welcome to the forum
A little search inside the forum give me that :
- Results of Write-on effect project
-
animated writing
you will found several projects linked you can examine…
also from the wiki : wiki.synfig.org/wiki/Doc:Write_On
Nota : if not already done, i suggest you to take the time to do the step by step manual from wiki.synfig.org/
have a nice and animated time with synfig.