I'm an all-grain brewer as above. Everyone starts with kits of extract though, so just follow the instructions to the letter. As stated above, the most important aspect is sanitation. You are not sterilising the equipment, but making it sanitary, preferably with a store-bought product.
I use 1 litre brown plastic bottles by preference. They are just easier to fill and screw the cap on. Capping glass bottles soon becomes very tiresome.
Best advice? Try not to panic........You will most likely panic at some stage, just try not to.
Best forum for tips: homebrewtalk.com