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https://www.backyardchickens.com/articles/aggressive-baby-chicks-and-how-to-stop-the-behavior.72029/ Read this and see if there are tips you can try.

You may very well have a cockerel. A few years ago, I found I had a baby chick, a Blue Plymouth Rock, that was excessively aggressive. It was being very hard on the others. At around four weeks, it began to pop out squeaky crows and was trying to mate the others. I decided to cull it.

Yes, chicks need light. Ideally, they need natural sunlight. You can start taking chicks outside on nice days at around age two weeks. Just watch for signs of chilling and protect them from too much sun or chilling wind as well as predators. This begins to toughen them up and get them ready for life outside in their coop and run by the time they're five weeks old. Many folks aren't aware that chicks are ready to live as regular chickens by five or six weeks.