Some thoughts on articulation...

How your articulation sounds is a matter of personal taste.

Established styles do require a certain sound so it doesn't sound silly--a classical articulation in jazz is just as strange as a jazz articulation in classical music.   Of course there is an infinite number of variations in every style, so it really does come down to taste--but your taste will be more palatable to others if you are well informed of the traditions in the style you are interested in mastering. 

As fas as the how, or specifically "where" one’s tongue should hit when articulating a note, it's sort of a weird question to answer--since one can't see what the tongue is doing, one can only say what it feels like, and then you can only attempt to copy what someone says into how you think it should feel to you, also without seeing it, it quickly becomes a very bad game of telephone! 

Ultimately, tonguing a note is really just the release of air (you can think of it as “un-tonguing” the note)--which involves your entire tongue--we often think it's the tip of our tongue but the air is being cut off by any part of of the tongue that cuts air off from the throat, so it's really an oval pattern that creates a seal cutting of the lips from the rest of the mouth.  It's strange but true!  In the end, how the articulation sounds is the best clue at whether what you are doing is working or not.  So get super clear what you're after, then use super simple exercises to hone in and copy the best sounding “articulators” you can find :)