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While having a lower density than air will allow things to float, there are very different qualifications for how things fly. Building something that flies is very complicated and takes a lot of research! For something to be able to fly, it needs to address four forces of flight: lift, weight, drag, and thrust. Most importantly, lift (which pushes things up into the air) must be stronger than weight (which pulls them to the ground). In planes, this is caused not by affecting density (a plane is definitely more dense than air!), but by creating an imbalance in pressure, in part through Bernoulli's Principle. It will take a lot of research to build something that can really fly!