i am thinking of making the ssd my main drive, and have the ssd as my secondary drive
I assume that you mean make your SSD your operating system drive, and your HDD (originally your OS drive) as a data storage drive. Correct?
The easiest way is to create an image of your main drive which I assume is on a HDD (Hard Disk Drive), then re-image it onto your new SSD. In doing this you will also create a backup of your system and data (which you should be doing anyway) so you kill two birds with one stone.
Two things you will need to do:
> make sure that your new SSD is at the very least the same size as your current HDD drive. Not smaller, or you will not have enough space.
> You will need enough space on your HDD to save the image created. OR the best idea is to have an external drive that you can save your backup images to.
Use Macrium Reflect to create the backup image. On first use MR will prompt you to create an emergency restore disk. Be sure to do it, do not skip this step.
After the image is created, restore it to your new SSD. Boot up and make sure everything is there. Then you can wipe your old HDD and move your data to it. If you wish, you can use this drive as your backup drive also for future backups.