It's important to know those, but if you OT, only can plus a few
hundred of dollars only.
You should calculate, how much you spend monthly, how much you save
money, see which expenses can you currently cut down on to save
more and maximise your savings.
Here's a method which i last time learnt : Collect this
numbers
1) Your desinated amount needed for Solemnisation
2) Your monthly savings per month
Step)
divide the 2 and you will get how many more months you need to save
for just the solemnisation and ROM
Note) but don't forget, you still have marriage expenses, house
loan etc to count in.
Additional information, i have PM you, if you're interested to know
more, just let me know 
I hope I can help with my passed yrs of experience in F&B, not
a lot, but still able to help you.
Regards,
the_fallen