I recommend starting a google sheet to track your Continuing Education Units (CEUs) straightaway. Here's a snapshot of my tracking sheet. I also use the tracking sheet to project out my needs for the year. I can attend 3 local conferences a year and meet the state requirements. It's a good reminder to sign up or make plans if I miss one due to a calendar conflict. There are various online options too, you can see a few of them below when I missed the Perennial Plant Conference both years.
I keep a Dropbox folder with all my certificates. I have a meticulous naming system to help keep them all organized and easily trackable without having to open them. YYMMDD_ConferenceName_CreditHours.pdf A number would fill in where credit hours is. And of course I keep all mine separated out into subfolders by renewal year, because that happens in May, and not on the calendar years.
Here's a snapshot of how I've been tracking my Continuing Education Units (CEUs) since the beginning.