Your LaserCut software is the software that drives your laser. It is capable of doing some basic cutting/rastering functions but it would not normally be the only software you would use.
A lot will depend on what you want to produce with your laser. For engraving you would need some photo editing software like Photoshop and for cutting a vector drawing package like CorelDraw.
If you intend engraving photographs I would recommend Photgrav. This software will help you resize, adjust resolution and process photographs into a usable format.
The files you produce with these softwares can then be imported into LaserCut from which you can send them to your laser.
I would also recomment that you read as many posts as you can both on this forum and over on Sawmill Creek. You will learn a lot in a short space of time, and you will continue to learn. There are many experienced users on these forums who are happy to share their experience and offer advice.