Can someone tell me how to connect these wires?
That depends on how you want the lights controlled. Are you going to have all of the lights on one switch along with the fan?
Do I have to many for a 4 way box?
Need more information. How deep is the box? What wire size are you using? Are there internal cable clamps or external? Do you have access above this area such as an attic?
Should I forget about the can lights?
That depends on how much you want/need the additional can lights. Even if it turns out that you can't use the existing box doesn't mean that the project is over. Sometimes you just need to find another way. Can you run the cable from one can light to the other and not use the existing box. That would save you a couple of conductors towards the box fill.
That depends on how you want the lights controlled. Are you going to have all of the lights on one switch along with the fan?
Do I have to many for a 4 way box?
Need more information. How deep is the box? What wire size are you using? Are there internal cable clamps or external? Do you have access above this area such as an attic?
Should I forget about the can lights?
That depends on how much you want/need the additional can lights. Even if it turns out that you can't use the existing box doesn't mean that the project is over. Sometimes you just need to find another way. Can you run the cable from one can light to the other and not use the existing box. That would save you a couple of conductors towards the box fill.
