I think you are talking about the Jquery SPServices library, you should start by reading the spservices documentation here:
http://spservices.codeplex.com/documentation
I'll give you a code sample, but to get this really working you need to read the documentation.
function GetEvents() {
$().SPServices({
debug: true,
operation: "GetListItems",
async: false,
webURL: '/',
listName: "Events",
completefunc: function (xData, Status) {
$(xData.responseXML).find("[nodeName='z:row']").each(function () {
events.push({
Id: $(this).attr("ows_ID"),
Nombre: $(this).attr("ows_Title"),
Descripcion: $(this).attr("ows_Description"),
TipoEvento: $(this).attr("ows_EventType"),
});
});
}
});
}