One really useful tip with family search is to search for children born to particular parents. This is very easy and often throws up many other children for a family, so that you fill out your tree rather than having long lines of families with a single child. As Peter has often pointed out it is far far more likely that you will find a Lost Cousin through brothers and sisters of your direct lines than you will find one of your direct ancestors.
To use the the children search feature do the following... I'll use the example of finding the children of John Bisset (my 2nd cousin 6 times removed) and Margaret McDonald
- Starting from the front page, click search link at the top of the page
- On this page enter the surname of the children you are looking for (in this case Bisset) DO NOT enter a forename
- Enter a country in this case Scotland
- The default should be on births (birth is greyed out) if not click on birth
- Skip birthplace, the key to these searches is that you don't restrict the results too much
- Click on parents to open up the parents list
- Enter John Bisset as forename & surname of father
- Enter Margaret McDonald as forename & surname of mother (NB. this works for Scottish records as women's maiden names were almost always recorded, For English/Welsh etc records leave surname blank)
Your form should now look like this...
Now click on Search and you should get back something that looks like this...
It might be a bit difficult to see on the forum image but try it for yourself on the
Familysearch.org website. What you should see is 10 entries for children matching the couple's names. However notice that the latter 4 are clearly from a different family as the years are a generation out. The correct family is the first 6 from Kincardineshire, as it happens the earlier couple are my lot too, just a neighbouring county

This is a very useful search technique, however use it wisely don't just assume if the name fits it must be yours. You need to back up the search with more research. However this search does give you lists of candidate names.
By clicking on each of the search results you can get the full details although the summary page has most of the info you need. This includes the exact date of birth/christening and the place it was recorded.
Sometimes getting that list of candidate names all you need, as sometimes the "brick wall" is when you focus entirely on your direct ancestor and don't try to see if you can find a sibling. So many times my direct ancestor doesn't show up in a census search but by finding a brother or sister on a census I find my direct living with them and missing from the index because of a really bad transcription errors. Often a bit of lateral thinking or in this case lateral relatives can solve a puzzle.
I hope this helps.