If you are in a hurry, adwords/ppc is probably your best go to tool. SEO is likely to take too much time.

Carlos, from my experience its a time consuming process which can take a quite a bit of time, how much time varies as others have mentioned, depending on your industry, target market and a how SEO wise your competitors are. As well as how many and what resources you have available to invest in terms of time and money into key ingredients like developing unique relevant content and partnership building for link generation etc.

I would at least wait it out for at least 6-7 months whilst monitoring ranking changes which I would hope are generally heading in a positive direction for target terms, before I start asking questions about my strategy. So I think 1 month is way too soon assuming you are looking at some high traffic/competition terms to rank for.

All the best though