nexus.6

Could anyone advise the easiest way to do this please? I’ve tried searching everywhere but many articles are too technical for me. Surely this can be achieved relatively simply? I would ideally like to make/ receive calls in conjunction with the multifunction steering wheel and if I can access my music too that would be a real bonus ( although I do at least have the 6 CD player in the boot). Thanks in advance for responses and apologies for probably asking an old question.