Adding a vector layer to a map ussing OpenLayers

Hello everyone...

I'm starting with OpenLayers, i have created some layers, presets and styles, then created some custom content types and show a map view where i can see nodes according its coordinates.
I would like to add some lines between the dots represented on the map, using a vector layer with the idea to could remove the lines using behaviors. I don't know wich is the better aproach to do this.

I was thinking on using functions from the OpenLayers API as this one http://dev.openlayers.org/docs/files/OpenLayers/Geometry/LineString-js.html, but i don't know where exactly put my custom javascript code. Would be recommended build a custom module for that or just add the code on a exported feature of some presets for example (or something else)?

Is it posible to add a vector layer throught the UI? Or at least create the base code for export where to put the custom code?

Is there a better way to do this using the API of Openlayers Drupal module?

Any ideas, articles, or code to look would be really helpful.

Thanks in advance.