The general process is that you have to try mediation first. That can take anything from 1-3 months (or I’m rare cases, longer). If that fails, you can then apply to the court. In my area, first appointments applied for now are being given court dates in December. As part of that you’ll each be expected to fill in a Form E (financial disclosure), exchange them with each other and send a copy to the court in preparation for the first appointment hearing.
Unless you’re my ex-husband, who didn’t do his Form E, then when we went to the first hearing last Dec, was ordered (with a penal notice) to produce it within 14 days. The next hearing was due in April but was cancelled, and we’ve finally got a new hearing for the end of Sept. Where we’ll probably have to repeat the whole process all over again as both of our financial positions have since changed, & his Form E was deficient anyway. 🙄
For completeness, I first applied to the court last July (2019), after nearly a year of failed mediation attempts.
And this is only the first hearing - there can be up to 3 hearings (although I’m told most only have 2).
So it really does depend on how much you each engage with the process.
If you’re really struggling financially and he is earns high, you can ask your solicitor to apply for an interim financial order - this is where he will pay you a set amount to keep you going until a final financial order is made. They’re not common and there has to be a clear case of need on the one side and affordability on the other.
Are you still in the marital home, and who has the children (if there are any)?