Customized form

I have created a table containing all the fields which I wanted. In
other words, I customized my own form. But, I do not want the form to be
auto-generated. How do I put my customized form in the new.rhtml?

Course Details:

*Course Code:

<%= text_field "course", "course_code", :size=>"5" %>

*Course Name:

<%= text_field "course", "course_name", :size=>"30" %>

*Programme Code:

<%= text_field "course", "programme_code", :size=>"5" %>

*Programme Name:

<%= text_field "course", "programme_name", :size=>"30" %>

also, i handled errors in model>course.rb but it doesn’t come out as it
does using the default rails form.

help please!