Are there any games that you guys really recommend? I pretty much only play sports games, but I want to expand my gaming world.
Is there anything good on sale?
No idea
Keyboard and mouse
single-player
I'd get some humble bundles, or bundles in general. Origin Access is $5 a month, might not be a bad idea to try it out. That'll give you access to a decent amount of games so you can narrow down which genres interest you and which to avoid. There's also free games from various stores pretty often(steam, origin, uplay, greenmangaming, fanatical, humble store). I'd avoid buying anything new or relatively expensive until you know what genres interest you.
If you go the origin access route the Mass Effect series (maybe skip 1, it's pretty old), some batman games, Unravel, Crysis 3, dead space, Bulletstorm, Tropico, and Dragon age are all fairly good, and will give you a good idea of what you might be into.
If first person games with lots of options on how to play sound fun I'd recommend Prey and Dishonored 1 and 2. If you end up liking fast paced first person shooters, Shadow Warrior 1/2 are great. Total Warhammer is solid for strategy, Beseige is nice for building, mount and blade warband gives you some third person combat plus some realtime strategy. Skyrim or fallout 4 are good starter RPGs, they're fairly streamlined. The saints row series is good for silly over the top third person shooting.
You could even just head to youtube and check out a few minutes of gameplay of some of the games I listed, or others you might be interested in. It's not nearly as good of an indicator as playing, but it might be a good start. I'd really suggest some bundles or a month of origin access though. I've bought games that are well liked and well made only to realize that while they're not bad games, I just don't like that style of game. It sucks.