new to juicing and need some help

i just purchased a new all in one juicer blender. i did alot of research on the internet about them and decided for the time and convenience that it was what i needed. since i'm new to juicing , hence the username, i was hoping somebody could give me some personal advice on where to start. such as what vegetables to start with, how much juice to drink in one day, when to drink it, and where to buy the vegetables and fruit. (is the local neighborhood grocery store out of the question). ive read alot about people making juice their every meal, but cutting out solid food totally is not an option for me.

also i would like to know if there are any retailers that sell "nut milk bags." the only place ive been able to find them are online.

i appreciate any information given on this matter