Should i use a water pic and floss in addition to an electric toothbrush? how often? are the manuals or videos about proper use of water pic and flossing for dummies (me?

You need both.traditional tooth brushing gets 65% of the plaque and bacteriae but 35% of it is left in between the teeth(interproximal spaces.) It generates cavities and halitosis ( bad breath). Floss or use your water pick at least once a day. Years from now you’ll be happy you did the extra work. If confused about how to use it, check: https://www.waterpik.com/oral-health/how-to-floss/

If you are using water pick then there is no need to use Dental Floss . Brushing before going to bed and in the morning after breakfast is good .The instruction to use electric tooth brush will be in the instruction manual..