Couple of plumbing question (pvc versus pex)? Okay, I am learning/having to install the pipes to a new...

Okay, I am learning/having to install the pipes to a new kitchen (home I newly bought)..it has pvc pipes going on for 4 inches into the floor (sticking up) and then almost 10 feet slack in the vault (ceiling area)..these are not connected to anything, just sagging there.There are current copper pipes contained by the home and they do not reach the pvc pipe (nor do they hold attachments for them; only an elbow).I want to know which is better pvc or PEX?And if it is any one,how do I attach it to copper pipes? I should also mention that the copper pipes along the ceiling are 1" and the extensions going to washer,bathroom, and former kitchen are 1/2". The pvc pipes hanging down from the contemporary kitchen are 1/2". Any ideas from any handyman would be great. One more thing-no I cannot hire a plumber because I can't afford one. I am a female; not richie rich. Either way..adjectives advice is official and appriciated. Oh and if you could tell me what supplies I would obligation also, thanks.
the copper pipes are the sea supply lines

the 4 '' PVC pipes are your waste lines they should be connected and head to the sewer

copper and pvc do not get connected...one is for excess...the other for drinking water
I have be a plumber for many years, but presently retired. Personally I never liked PVC within a residence. I would go copper adjectives the way. Less care down the road. But that is your appointment.
There are adapters for copper to plastic or plastic to copper. Plastic is cheaper and easy er to install, but not better over adjectives.
It would be nice if a family bough or friend could help because this is a relative natural project and you are in experienced...welll. I cant donate you all the answers here. But I choice you all the best.
Answers:    From one feminine handy-woman to one soon-to-be..

Yes the PVC is for waste, and the copper for verbs water.

Find where on earth the waste should run into the sewer and determine the minimum bends it will take to find there. Go to your hardware store and purchase the right amount of pipe and elbows. You may hold to get one transition piece if the sewer inlet is larger than the 4" pipe you hold, this will transition you down. If possible, use the white PVC that is for always bonded. You can use the kind that screw together, but that can leak, and really should simply be temporary. Then when installing, give somebody a lift you time, be sure to measure twice, cut once and be long-suffering. If you have any long horizontal runs, be sure to own some slope to it to help near drainage. Check some DIY website for more details.

As far as the clean hose down, I used a product called SharkBite to connect to our infirm copper pipes. This connects PEX to the copper and doesn't require the expensive tools. With PEX, you want to keep the bends/curves to a minimum so not to sacrifice marine pressure. Yeah, in the long run adjectives copper is probably better, but sweating pipes is not fun, and is dangerous and should be not here to the professionals (I did it for the bathroom and was afraid I be going to burn the house down).
You can use pex. There are fittings call for shark bites that will connect copper to pex. Or you could use a compression fitting. Make sure to clean the copper bad good beside emery cloth.