When to use accusative case, explanation of reflexive verbs

Hello,I am learning Russian. I have taken one year of Russian in University and I have 2 questions:1) When do you use the accusative case? For example, is this correct? Вы хотите конфетку? - Do you want a candy?ORВы хотите конфеткa?I think I sometimes do not use the accusative case when it is needed and I would like to clear up my confusion.2) Is there any special meaning attached to reflexive verbs? Are they used differently than non-reflexive verbs?Thank you very much.Candace