How do I get blueprints from the marketplace to work with each other?

I want to use blueprints, such as ability system, quest system, and equipment system. How would I get those blue prints to work with one another?

I assume you mean diffrent products in market place

You need to modify so they do work with one another, there no way around it, programming is not magic and things won’t work without proper code. Some packages might not be cooperative due to way they are build, some creators will probably make there products cooperate so they will work out of the box, if your products come from one creator you can contact him and propose to make them work with eachother, Other then that you will need to make them work together in some way or another.