2-3 mins each time with a very soft toothbrush, bedtime/morning and after meal. You shouldn't use any force at all when brushing, just be gentle! Using force or hard bristle toothbrush will cause gingival recession and abfraction (wearing of the enamel, leaving semicircular hole close to the gingiva).
Floss after each meal to prevent bad breath and interproximal caries (decays between the two teeth).