If you don't know what you're doing, you should stop. You're likely going to face more problems than you're willing to deal with.
Otherwise, why do you want Linux? As long as you're sure that you'll be able to do everything you currently do hassle-free on Linux and you'll be able to do something you've wanted to do but couldn't on your previous operating system, only then would I consider installing linux. Looking for linux/wine support on all the programs you use frequently will be a good start for this. Blockland, for example, has great wine support but Skype doesn't have all that great PulseAudio support.
To choose which distribution you should use, you will probably not want to look much at its presentation but rather what hoops you'll have to jump through to get it installed and what things it'll already have for you, what you'll need to install for yourself, and what you'll need to uninstall possibly to replace with something else. The beginner and basic distro would be Ubuntu, it's extremely easy to install and should have everything you'll need. Ubuntu is a modification of Debian, which is complicated to install, is very slow and has not so many features. There are plenty of reviews online for more distributions, you just have to know where to look. Blockland forums is a bit small and it may be hard to get judgement on all the distros you're looking to try out.
I second what TBP said with USBs, if you have one it's easier to use that than a disk to install things. You can wipe it and put something else on easily if you tried installing one distro but it didn't work out for you.
A final thing, you're always going to need the option to boot back into your previous OS, so keep it on its own partition. Also, do NOT delete the partition you're trying out your distro on until you're doing it while installing another. It's likely you'll have GRUB installed on it, and you don't want that breaking so you can't boot into your previous OS even if it does still exist on your system.