There isn’t any shortcut in DSLR photography. Until and unless you know what you are doing, you are wasting your money and time, be it a Nikon, Canon or Sony. One learns it through experience and experimentations. It doesn’t come in a day or two.
When you choose a body, availability/selection of compatible lenses should be one of the most important priorities. You will only realize it once you outgrow your kit Lens and AF /P&S world. There is a reason why Nikons and Canons are preferred more and availability of lens options/ selection is one of the major reasons.