Straight swap with factory wiring for the rears, I tend to keep the volume pretty low so the stock amp would do for now without blowing up until I get the amp replaced.
For the front factory speakers, it uses a splitter connection so half of each signal goes into the woofer and tweeter. If you used component speakers, you’d have to cut and splice at the splitter containing 3 positive, 3 negatives ( 1 input 2 outputs each ). You’d wire the single inputs to your crossover and route them to the tweeters and woofers.
This video works as a good general guide.