Hi,
read the latest from lordna, and there are obviously different responses in different areas, my husband and I did both the family planning and the marriage guidance seminar even though we were both over 21 - we got the marriage guidance signed off in 5 minutes as we were living together and therefore apparently know all the ins and outs of married life (!!) and had to spend 3 hours listening to tagalog discussion for the family planning (nothing about FP though!).
Also I didn't need my birth certifcate at all for any of the process - but be prepared for all eventualities, if you 'might' need it, take it and be prepared to do seminars - even though you may be able to skip them in reality..
good luck, stay focussed and enjoy the day