2004 Chrystler Pacifica no heat need help how to fix?

[Undecided A]

Hello i have a 2004 Chrystler Pacifica, last year the heat when I turned my car on, would stay on full blast, I could not regulated it to turn it down to stop it blowing so hard. After some time of it blowing so hard, one morning driving there was a very funny smell like something burnt out and then all of a sudden my heat cut out and now I can not turn it up. When I turn the knob the heat doesnt turn on. And I cannot feel any air. Can anyone please tell me what I should check, I am a single mom and cant afford a mechanic, so if I can I would like to figure it out myself, I am really handy and can follow directions well. Thank you