I’m not sure about jsuneido on 32 bit. In theory if you have a 32bit JVM then it should work but I haven’t tried it. Of course, 32 bit will limit the size of the database.
To run it you need to specify -s for the server and -c for the client:
java -jar jsuneido.jar -s
suneido -c
You can specify a script for the server e.g. to use additional libraries:
java -jar jsuneido.jar -s mystartup.txt
See also: Users Manual > Getting Started > Running Client Server