How to mark / colorize street parts?

So, after further searching i found a possible way to get the street coordinates... Web Feature Service (WFS). Now i just need a example WFS to try what kind of polylines and methods a WFS transmits.

In combination with Leaflet, it should be simple to draw the transmitted PolyLines as layer... well, i hope so :)

Still working at it... and yep, its not that simple as i thought before...

the demo-server is working fine. I tried the following featureType

<FeatureType>
<Name>og:roads</Name>
<Title>roads</Title>
<Abstract/>
<ows:Keywords><ows:Keyword>features</ows:Keyword><ows:Keyword>roads</ows:Keyword></ows:Keywords><DefaultCRS>urn:ogc:def:crs:EPSG::26713</DefaultCRS><ows:WGS84BoundingBox><ows:LowerCorner>-103.88034577292942 44.30742621244438</ows:LowerCorner><ows:UpperCorner>-103.62013461674628 44.567637368627516</ows:UpperCorner></ows:WGS84BoundingBox></FeatureType>

with the following code:

        map = new L.Map('map', {
        center: new L.LatLng(44.095475729465, -72.388916015626), 
        zoom: 7,
        layers: [mapquest],
        zoomControl: true
    });


    var owsrootUrl1 = 'http://demo.opengeo.org/geoserver/ows';
    var defaultParameters1 = {
        service : 'WFS',
        version : '2.0.0',
        request : 'GetFeature',
        typeName : 'og:roads',
        outputFormat: 'json'
    };

    var parameters1 = L.Util.extend(defaultParameters1);
    var URL1 = owsrootUrl1 + L.Util.getParamString(parameters1);
    alert(URL1);

    var ajax = $.ajax({
        url : URL1,
        dataType : 'jsonp',
        jsonpCallback : 'getJson',
        success : WFSLayer
    });


    function WFSLayer(data) {
        console.log(WFSLayer(data));
    L.geoJson(data, {
    style: function (feature) {
        return {color: 'black',
            fillColor: '#ff0000',
            fillOpacity: 0.10};
        }
    }).addTo(map);
    }

The alert(URL1) is working, this is the output: http://demo.opengeo.org/geoserver/ows?service=WFS&version=2.0.0&request=GetFeature&typeName=og:roads&outputFormat=json

So far so good... but what should happen next? There is no visible success. i thought the WFSLayer() function add a visible Layer to my USA-Map. Need HEEEELP !!!! :D

no, seriously... please help me THANKS in advance

ps: i´m from germany, so if you want to answer in german, no probs ;)