Are you planning to use the ssd for both windows and your games? If so, you've got the right idea. Disconnect the existing hdd, install the ssd and install windows, current drivers, windows updates and your games. Once you have that set up, reconnect the hdd and use a third party program such as g-parted to wipe the o/s and games partitions on the hdd. Don't forget to remove the windows recovery partition also.
I would suggest leaving your data alone on the hdd and using the newly freed space as an additional storage/data partition. If you try to resize the existing data partition to "fill" the hdd, you run the risk of losing some data during the resize.
Gparted is available as a stand alone, but can also be run via linux. If you download a linux distro such as linux mint or ubuntu and run it from a usb, you can access gparted through the menu system and do all the operations from there. Get a program called "yumi" at pendrivelinux.com, install it to your current hdd then use it to format a usb for multiboot. Point the program to your distro download and it will create a live usb that you can boot and not only try linux, but also use gparted to clean your hdd.
As far as preparing and installing on the ssd, read THIS
guide - it is very well written and gives you all the info you will need.
Before you use the gparted, do a little reading (there are a lot of threads on gparted) so that you know what to expect.