10 clubs knocked out teams from a higher division on Saturday
Boreham Wood come from behind to beat League One Blackpool
Sixth-tier strugglers Oxford City win at League Two Colchester
National League Maidstone defeated Cheltenham 4-2
Second-round draw on Monday at 19:00 GMT on BBC Two
Shaw Lane v Mansfield (12:30 GMT)
Both sets of players emerge at a packed Sheerien Park.
Shaw Lane are used to crowds of about 200 - there are around 2,000 here this lunchtime.
Who's going to make themselves a hero? Are we in for some FA Cup romance?
The pitch looks fairly heavy, but it should hold up.
Shaw Lane v Mansfield (12:30 GMT)
Image source, Rex FeaturesMansfield, under the stewardship of Steve Evans, failed to win a League Two game in October.
They've also been knocked out in the FA Cup first round in the last two seasons.
Everything is pointing towards a Shaw Lane shock.
We'll find out shortly, kick-off is imminent.
Shaw Lane v Mansfield (12:30 GMT)
Image source, Rex FeaturesIt may be the biggest day in Shaw Lane's brief history (they were only formed in 2012) - but it's also going to be a poignant one.
The tie comes 14 months after their defender Daniel Wilkinson collapsed and died playing in a cup tie. He was just 24.
Shaw Lane have since named a stand in Daniel's memory and retired his number five shirt for the rest of the season.
You can read more about his story in Neil Johnston's piece here.
Your pictures of your FA Cup journey
Ed Pearce: We're off to Hereford to watch Telford. A 250-mile round trip from Southampton, all for the love of the Cup!
Image source, Ed Pearce/TwitterMichael Roberts: Away day, why not...
Image source, Michael Roberts/TwitterKeep your pictures coming using #bbcfacup on social media.
You'll be able to watch every goal from the FA Cup first round on the BBC Sport website and app, and we'll bring goal clips to you throughout the day, starting during Shaw Lane v Mansfield.
Then, after 17:15 GMT, we'll be able to show you the goals from this afternoon's 15:00 ties.
In the meantime, to catch up on any of the action, just head to our FA Cup page.
Your BBC local radio stations will have live commentary on air and online from today's FA Cup games.
As the afternoon goes on, you can select choice of commentary by clicking here.
In the meantime, BBC Radio Nottingham's Jake Garner is on the mic at Sheerien Park.
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The first round got under way last night with three ties, including MK Dons' routine 4-0 win at eighth-tier Hyde United.
There were also two victories for League Two sides at home to League One opposition.
Notts County fought back from 2-0 down to beat Bristol Rovers 4-2.
And struggling Port Vale produced another shock as they were 2-0 winners over Oxford United, who reached the fifth round last tier.
Shaw Lane v Mansfield (12:30 GMT)
Here are some handy bullet points...
Shaw Lane v Mansfield (12:30 GMT)
Image source, Rex FeaturesMore than 500 Mansfield fans are making the trip to the 2,000 capacity Sheerien Park, so the club has installed a temporary stand.
And some new turnstiles. Ah, the magic of the FA Cup!
Boreham Wood v Blackpool (15:00 GMT)
Football Focus
Boreham Wood manager Luke Garrard: "It's good for the town. There's a nice buzz but I've tried to keep things as simple as possible.
"I'm calm at the moment - the closer we get to kick off, the more it will dawn on me that we're playing Blackpool in the first round of the FA Cup."
Image source, BBC SportGet involved #bbcfacup
Are you off to one of the 27 first-round ties today? If so, tell us the story of your day!
It doesn't matter if you're going to Carlisle in the north west or Ebbsfleet in the south east - we'd love to see some pictures of your journey and your view inside the stadium.
Get in touch using #bbcfacup on social media, and we'll use a selection in this live text commentary.
Image source, Rex FeaturesOnce the game at Sheerien Park is done, 25 matches kick off at 15:00 GMT.
AFC Wimbledon take on last season's FA Cup quarter-finalists Lincoln City, while 2008 winners Portsmouth travel to Luton.
2013 champions Wigan, second in League One, host Harry Kewell's Crawley Town.
Three seventh-tier sides are also in action...
Hereford FC host AFC Telford, Slough Town visit Gainsborough Trinity and Nantwich Town travel to League Two Stevenage.
Football Focus
Dan Walker, Kevin Kilbane and Dion Dublin are live at Boreham Wood for Football Focus, which has just got under way on BBC One - you can also watch the programme by clicking the play button at the top of the page.
We'll bring you the best bits in this live text commentary.
Shaw Lane v Mansfield (12:30 GMT)
One team hoping their journey can continue is Shaw Lane.
The Barnsley-based seventh-tier side take on League Two Mansfield in our early kick-off.
It's the Ducks against the Stags - it's a live text commentator's dream ticket!
Image source, Rex FeaturesOver the next few hours, 54 teams will battle it out for a place in the second round of the world's oldest cup competition.
And you can follow all the shocks and surprises right here - we'll have live text and radio coverage, plus video highlights of the key moments.
For others, there will be heartbreak...
Image source, Getty ImagesFor some today, the dream of making history will continue...
Image source, Getty ImagesFA Cup miracles can happen...
Image source, Getty Images