When I turn it on the fan works then when the ignitor kicks on nothing else happens to get the heat on.

You never said the make and model, and that's a good thing to look up and see what the manual says, or get some trouble shooting guidelines to follow. Not a thing for the average person to undertake with no skills, experience, or tools.

I know experts are expensive, but you can waste a lot of time and money doing it yourself so what kind of skills do you have. You could always just go to YouTube and see the videos of your models issues and decide if this is even worth putzing through, or should an expert be called. There is a good reason professionals are TRAINED, LICENSED, BONDED, and CERTIFIED to work on furnaces.