There's really no one size fits all in photography, as there are too many variables to consider - prevailing light, whether the subject is static or moving, what you want to achieve from your image with regard to depth of field and whether or not you want to introduce a bit of movement blur to emphasise a moving subject.
Personally I would start in either Av or Tv mode, take photos of fairly simple subjects, and take several images adjusting the settings in between shots. This way should help you gain an understanding of what the settings actually affect in your photograph.