Create a Document Library with column values programmatically with Javascript

I need to create a Document Library and assign it columns with Javascript.

I've been searching around and I found the SP.ListCreationInformation documentation. Here is my code so far:

function createDocLibrary() {
    var ctx = new SP.ClientContext.get_current();
    var web = ctx.get_web();

    var lci = new SP.ListCreationInformation ();
    lci.set_title('My Custom Title');
    lci.set_templateType(101); 

    this.oList = web.get_lists().add(lci);
    ctx.load(oList);
    ctx.executeQueryAsync(Function.createDelegate(this, this.newPBDLSuccess), Function.createDelegate(this, this.newPBDLFail));

}
function newPBDLSuccess() {
    alert('success');    
}
function newPBFail() {
    alert('fail');
}

I can create the document library (thanks @Dylan Cristy for catching my mistake - I updated the code on this post), but am stuck on how to create the libraries columns with javascript.

Also, I'm using ExecuteOrDelayUntilScriptLoaded(createDocLibrary, "sp.js"); to ensure sp.js is loaded first.

Does anyone have a working example of creating a Document Library (or list) and setting its columns with javascript?