Carlos, I agree with the others. If you are trying to get results today, then I would run a PPC campaign. If you can't afford PPC hen I would try to rank for some long tail keywords that have some traffic. Go for the low hanging fruit and as you build your website up you can rank for more competitive keywords later. Depending on your niche, I would also consider social ads. Hope this helps. One month to rank for most keywords isn't realistic but if you are consistently doing it right, you should see some traction sooner in a few months unless its ultra competitive. So go through the back door and look at some long tail keywords.

In my opinion I have seen both tactics work, it really comes down to how much Google trust the domain and your web site. If you are going to do a 301 redirect, I would do a very in depth link analysis and make sure that nothing is spammy. Make sure you really dive into the quality of back links that the URL has as well as how diverse the link profile is from a link standpoint and anchor text standpoint. A buddy of mine thought a URL was good but got penalized because to many links were coming in from the same type of sources even though it wasn't the same source.

You also need to check your link profile and make sure it is well diverse as well. This will help the url blend in more natural. I agree with Moosa, I would only use this tactic one or two times. If you are thinking about doing a PBN I wouldn't recommend it. However there are plenty of legit ones that really build out great content and information and are legit, but in my opinion if your going to spend all the time and money doing that you could spend it on your website. Good luck