I'm looking at becoming a Diana main as I currently main Rek'Sai and while she can be fun and really good at map awareness I sometimes feel lackluster as I essentially build her as a knockup bot and ward for my team...

I've been looking at some champs and out of the few that caught my eye I really like the look of Diana, she's the complete opposite of Rek'Sai and in certain comps I feel she would be much better for me and also she looks fun as hell but I'm stuck with how to get the best out of her and what her best combos are, am I right in thinking Q>R>W to do the most damage or am I wrong? Also in what scenario would E be really useful?

I can probably find a lot of this information from Google but seeing as this reddit is for people who play/have played her a lot I'd prefer your opinions