If you are transferring from essentials to CMI you can use dedicated command to import players information from essentials to CMI. Essentials plugin is not needed for it to work.

/cmi importfrom essentials [home/warp/nick/logoutlocation/money/mail]

home
 – will import home locations
nick – will import players nick name
logoutlocation – will import players last logout location
money – will imports player money balance
mail – will import players mail
warp – will import warp points

you can use more than one variable at a time, or even all of them, in example: /cmi importfrom essentials home warp nick logoutlocation money mail

This process can take some time. in general its converting 200 users in one second and you will get feedback message informing about process.

If you want to use old worth.yml file, then simply copy/paste it into CMI folder from Essentials and you are good to go.

By default only small amount of commands have alias enabled so you could use shortened commands. So by default majority of commands will require full command usage like /cmi heal Zrips To enable short command you have 2 options: to enable it in alias.yml or to create your own.

Enabling throw alias.yml: Go to alias.yml file and look up for any alias you would want as short command. In example if you want /heal command then simply go to appropriate section and set 

Code (Text):
  /heal: true

Creating custom alias: You can create any alias you want throw ingame command /cmi aliaseditor which by itself has 2 options how you can create new alias:
1. Use generic one liner: /cmi aliaseditor new heal-cmi heal $1- which will create command as /heal
2. Click on + sign in chat window and enter heal into chat window, press enter, then again press on + sign, then enter cmi heal $1- and press enter again. You are done, now you have /heal enabled and working. You can add more than one command which will be performed in a row and which supports special CMI command format, we call specialized commands which wiki can be found HERE and which is extremely powerful

Extra variables in alias command like $1 will mean that first variable will be taken and replaced in this alias. In example /cmi aliaseditor new heal-cmi heal $1 and while performing /heal Zrips first variable, in this case Zrips will be replaced in original command and end command will look like /cmi heal Zrips
This allows for variables to be replaced in ordering, in example /cmi aliaseditor new tps-cmi tp $2 $1 and performing /tps Zrips Zhax will result in command like /cmi tp Zhax Zrips
In case you need to add all variables after certain point, use format as $1- in example /cmi aliaseditor new ms-cmi msg $1 $2- and performing command like /ms Zrips Hello World! will result into /cmi msg Zrips Hello World!