i have a 10 year old pony that has never been broken in properly; she's good with a saddle and briddle but when it comes to getting her to do what you want her to she doesnt understand what your asking for. is it possible to lunge her to get her going? Baring in mind; id only be using a field!!
If you've never started a horse by yourself before, then I strongly suggest you get a trainer or experienced horse-person to help you. An inexperienced person trying to train a green horse almost always ends badly for both of them.