Hey thanks for offering to answer questions. I have a few. I currently have a 2013 Spark LS w/4 speed automatic transmission.
1) Would it be possible to have a CVT transmission put on this one?
2) Any recommendations for having a cold air intake on one?
3) Lastly, any general information about the car like tips/tricks? I really love the handling of this car. The size of it and the practicality of it makes me want to bring it up to its max potential.
1) Anything is possible, but it would be more cost-effective to sell your current Spark and buy another. Swapping the trans would void your powertrain warranty and cost a ton between parts and labor, plus having to reprogram or even replace your ECM/TCM.
2) Please don't put a CAI on your car

For what these cars are, a CAI won't help a noticeable amount. The ECM is programmed for a specific air:fuel ratio and also goes off of your IAT and MAF readings. This is all worked out to give you the best combination of fuel economy and power. Sorry, I just hate CAI's on economy cars. Defeats the purpose.
3) Don't go off of the OLM % please. Check your oil every fuel stop. I know it's basic and boring, but check it. Change your oil every 3k for city driving and no more than 5k for freeway driving.