What is amicable now can certainly change in the future and for a multitude of reasons – and this can be a few days after separation up to years after so….
Financials are the easy bit if you can agree something amicably – but make sure you are both independently legally advised and get everything in writing, including the fact that this is a full and final settlement to minimise the future financial issues (though childrens age may prevent this) but certainly ensure that you have in writing that both of you agree that the other has made a full disclosure of their financial position and this is the basis of the agreement.
In relation to contact then the way family courts work I wouldn’t invest too much time on a contact order, if in future Mother wants to really prevent you having a relationship then that piece of paper will be all but useless, longer term its about how the children feel and that is down to you to invest time in them and build that relationship – that is the best outcome for everyone involved
…and if the relationship with your ex does go pair shaped then seriously consider whether what you are arguing about will really matter in a years time and always act in the interest of the children having an ingoing relationship with you, not you getting ‘your time’ with the children