There is no such thing as a quick divorce.
All divorces are filed on the basis that the marriage has irretrievably broken down, but there are then 5 grounds on which a Petitioner (the party who seeks a divorce) can rely.
In order to divorce immediately rather than wait two or five years (or prove desertion), a petitioner would rely on a respondent’s unreasonable behaviour or adultery.
None of the grounds of divorce automatically affect how the finances or arrangements for the children are dealt with. The procedure for each ground relied on is exactly the same.
A petition is filed with the court, the respondent files an acknowledgment of service, decree nisi is applied for and then pronounced. 6 weeks and 1 day after decree nisi a petitioner can apply for decree absolute.
However, it is advisable to resolve the finances of your marriage prior to applying for decree absolute or at the very least seeking legal advice on your financial situation before applying for decree absolute.