http://www.japan-guide.com/e/e2358_008.htmlhas a colour coded map of available services. The Romance Car trains are simply a better class of train and that is why there is a surcharge.
http://www.odakyu.jp/english/rc/index.html
fish around in there and it will show you the Romance Car timetable...this is it :-
http://www.odakyu.jp/english/rc/rc_timetable_a01.html
You will get the other train times from
http://www.hyperdia.com/cgi-english/hyperWeb.cgi
Just make sure that you only look at the results that show Odakyu Rwy only and if you want to avoid the surcharge for the Romance Car then avoid the "Odakyu Ltd Ex Hakone" trains.