Kitchens can be a challenge for alot of folks. The truth is, if you understand how a sink works, you can renovate a kitchen and make it look really good for not too much money.
1) Drains: Replace all drains coming out of the wall to the sink
2) Electrical: After turning off the power, note the three wires going into the disposal, and the ones going into the dishwasher. three wires....Black, white and green. Get yourself a book on electrical, and at least understand what it takes, then call the electrician with your list of "what to do"
3) Other plumbing - water supply...only two lines, hot and cold...usually a disconnect under the sink...replace all valves EVERYTIME, and replace everything from the valve to the faucet.
4) Faucets...not rocket science...all go on the same way...loosen up from below, have someone hold it above...you may have to twist alittle, but no pain no gain and save yourself $100 installation per faucet.
5) Cabinets...plan it on your own on paper...then go see a professional, after you layout the location of the dishwasher, new stove and refridgerator.
6)Do not buy a Fridgadaire...worst appliance I have ever fought with...they may appear to be cheaper, but unless you enjoy being abused by a service person in some remote foreign country, get a GE or equivalent.
The secret is to PLAN everything...from the floors(ceramic or better) to the ceilings(extra lights). Do not go on the cheap..don't cut corners...better to have less countertop, but a quality countertop than 12 feet of cheap formica.