It's very tempting to go mad and follow blind leads when you're first starting out. I did this myself, and then spent even more time correcting the mistakes that I'd made.
It really is essential when you first start out, to get certificates for the foundation of your family tree, because if you make a mistake early on, it will make the rest of that branch completely useless.
I can remember waiting for my first certificates to arrive - it seemed to take forever ! However, when they do arrive, it will give you more to work with. The marriage certificate will give you the places where your grandparents were living at the time of their marriage - don't be shocked if they appear to be living at the same address - people did this to avoid paying for banns to be read in two different parishes. You should also be able to see the father's names of the bride and groom, and their professions. And, of course, you will see the date of the marriage, the occupations of the bride and groom, and (probably) their ages. Don't forget to take note of the names of the witnesses, who could well have been family members.
The birth certificates, in addition to giving the date of birth, will give the place of birth, which you may be able to find on a census, if it is 1911 or earlier. You can use the names of the parents to tie in with the marriage certificate, to ensure you have the right ones. From the names and addresses of the parents on the birth certificates, you should hopefully be able to trace them on censuses, and also find their marriages.
Good luck with your hunting !
There's lots of people on here to help, if you get stuck
