This will be the silliest question; but im clueless

Where do I start? Do I go to a gp and ask? Then do I see a gyno or what? I sound so daft but I'm thinking its the best contriseption for us (as dh wont get the snip) and my body goes 'eff you pill' in 6months (21day cycles suck!!) And I want something I dont need to think a whole lot about too.

So how do I get the ball rolling?