You can do a lot using
.ssh/config file. It would allow you to replace this:
ssh firstname.lastname@example.org -p 22000
to do so you have to add the following lines at the end of the
.ssh/config (create it if does not exist)
Concerning the storage of your credentials, I strongly advise you to use key authentification instead of password based.
You can create them either with a GUI or with your terminal.
File > New, then
Secure Shell Key and let the interface guide you
Create you RSA key pair:
ssh-keygen -t rsa
Store the Keys and Passphrase:
Enter file in which to save the key (/home/demo/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Copy the Public Key