My answers - off of the top of my head - are in bold type.A Republican win is dependent on that being evident to the voter. To do that, Republicans will have to stop waring against Obama and get much more pro-active than they have been in the idea department, or at least do a job of any kind in letting someone know they have ideas.
They will need a new battle plan for Islamic terrorists. (bring every American soldier home, stop drone strikes and close Gitmo, slash military budget in half...let the Middle East work out it's own problems)
They will need a workable program for dealing with illegals, and to do that they must act to stop the flow as a priority, make it stick before they will have any acceptance on any amnesty. They will have to avoid that word, LOL. (build an Israeli-style wall on the Mexican border. In other words - lock the border down tight. Give every present illegal who has committed no crimes amnesty and a green card and after the wall is up, every, single illegal alien is sent home immediately - no matter age or excuse. If they want to come to America, go through official channels from home)
They will need a clear plan to get the economy back on a footing with some substance. (End the Fed, balance the budget, stop bailing out corporations and get the government to leave the economy alone except for welfare for those who need it - not just want it).
And they will have to at least, begin a dialogue on creating a real, workable health insurance scheme. (kill Obamacare, give every under 18, disabled person and Americans born before 1965 full government healthcare - everyone else just emergency healthcare - though once the baby boomers die out, the full government healthcare dies with them [still give it to children/disabled]. End all government regulations for healthcare except for medical standards and practices. In other words, strongly encourage competition among insurance companies. If people fall through the cracks - there is always charity.)
Otherwise, the meme of not having no alternate plans of their own will stick.