Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
How long have you been together and can I assume language is not an issue?
Provided you can show that you earn more than £18,600 and have done so for at least six months then she can apply to come to the Uk as your partner
The details are here
It would indeed be better to have married first.
Please ask if you need further details
You are welcome - I hope all goes well