1. if the preamp you're looking at doesn't have an inboard phono preamp, then you would need a separate phono preamp. you're probably best served getting a preamp with a phono input--if you specify a budget you'll get many recommendations.
2. you don't need a separate dac unless (a) you're using digital sources such as a cd player, and (b) you're dissatisfied with the quality of the dac built into the digital source.
2. you don't need a separate dac unless (a) you're using digital sources such as a cd player, and (b) you're dissatisfied with the quality of the dac built into the digital source.