How do I find the best contractor or company to help me install all new windows for a great price?!

I have around ~24 windows that are over 50+ years old and in really bad shape and need to be changed. How should I go about looking for the best contractors or companies to give me the best prices for windows? There are so many types of windows like double pane, double hung, vinyl, wood, etc. And should I do new construction windows or replacement? It is a little overwhelming and I need help! I don't even know what a good price would be. Thanks.