As others have said, we really can't tell you what NPK fertilizer is right for you. It is also worth noting that there are other needed nutrients besides nitrogen, phosphorous and potassium which are equally important. Additionally there are other ingredients in many fertilizers today such as organic or synthetic chelating agents, amino acids, carbohydrates, plant extracts, etc.
Best thing to do is have some kind of a plan as to how you plan to grow and then research the products\line you intend to use. Most all plant food\supplement manufacturers have some kind of pamphlet or product information that they provide or which can be found on their website, detailing usage and often including feeding charts.
Transplanting into a high quality amended potting soil is a good way to avoid having to use bottled nutrients often. This is mainly what I do, along with using some Earth Juice or General Organics.
The Earth Juice Grow is a 2-1-1, the Bloom is a 0-3-1. As you can see by the chart it recommends tapering the Grow with the addition of the Bloom. In practice, and with larger\faster growing plants you might give up to 2 tbsp of Grow, which is what is recommended for larger plants. For example, you could use 2 tbsp Grow, 1 tbsp Bloom on weeks 5\6 of veg (if you opt to veg longer). By week 4 or 5 of flower you might be using 2 tbsp of Bloom and 1 Tbsp of Grow before cutting it out almost entirely.
hope this helps
