Nested Form with Many-to-Many relationship - Rails - ruby-on-rails

Question

I'm learning Rails and I'am pretty stuck building a nested form with many to many relationship.
I was able to get the many-to-many relationship working with has_many :through, but when it comes down to create the views and the controllers to get it working I'm getting stuck.
See models relationships below:
class Timesheet < ActiveRecord::Base
belongs_to :user
has_many :timesheet_payments
has_many :employees, :through => :timesheet_payments
accepts_nested_attributes_for :timesheet_payments,
:reject_if => :all_blank,
:allow_destroy => true
accepts_nested_attributes_for :employees
end
class Employee < ActiveRecord::Base
belongs_to :user
has_many :timesheet_payments
has_many :timesheets, :through => :timesheet_payments
end
class TimesheetPayment < ActiveRecord::Base
belongs_to :employee
belongs_to :timesheet
accepts_nested_attributes_for :employee,
:reject_if => :all_blank
end
See db schema below:
create_table "timesheet_payments", force: true do |t|
t.integer "employee_id"
t.integer "timesheet_id"
t.float "basic_hours"
t.float "sunday_bh_hours"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "timesheets", force: true do |t|
t.date "upload_date"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "employees", force: true do |t|
t.string "pps_no"
t.string "fname"
t.string "lname"
t.date "dob"
t.text "address"
t.string "ph_number"
t.float "basic_rop"
t.float "sunday_bh_rop"
t.string "email"
t.date "date_joined"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
I want to create a form where I can create a new Timesheet, display all Employees and an field to add the basic_hours and sunday_bh_hours for each employee.
This would be similar to the idea of a relationship between Customer -> Order -> Products.
I hope this makes sense! Thanks in advance!
I tried this view form
<%= form_for(#payment, :html => {:multipart => true}) do |f| %>
<% if #payment.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#payment.errors.count, "error") %> prohibited this payment from being saved:</h2>
<% end %>
<!--creates a new timesheet -->
<%= f.fields_for :timesheet do |builder| %>
<%= builder.label "New timesheet" %>
<%= builder.text_field :upload_date %>
<p></p>
<% end %>
<!-- Add worked hours for each employee -->
<% #employee.each do |t| %>
<%= f.label t.fname %>
<br />
<%= f.label "Basic Hours" %>
<%= f.text_field :basic_hours %>
<%= f.label "Sunday/BH Hours" %>
<%= f.text_field :sunday_bh_hours %>
<br />
<% end %>
<%= f.submit 'Submit', :class => 'btn btn-primary' %>
<% end %>
It is loading fine but i really can't get my head around how I go about creating the "create" method on the controller.
I have the "new" method is following:
def new
#payment = TimesheetPayment.new
#timesheet = Timesheet.new
#employee = Employee.all
end