Uther is possibly the best support hero in the game. That is due to his ability to burst heal, his utility abilitys such as cleanse and shrink ray, a great stun and divine shield which is an amazing ability for supporting assasins.
This Uther build is difficult to play becouse of many extra abilitys aquired by talents. There are no special tips for this build other than try to use your abilitys to max value. Egzample use cleanse if a hero is stunned, use shrink ray on enemy assasins in the beginning of fights but most importantly your level 16 talent benediction allows you to use your stun 2 times in a row. A small combo you should use is: benediction > stun > short delay > stun. This allows you ro lock down a target for a long time. Use divine shield as late as possible and you should be fine.