I agree with How To ADHD. Bite sized tips usually under 10 minutes long.
If you read, there's a book called "So I'm not lazy, stupid or crazy?!" something like that. It's nowhere near as technical as Barkley's book and is a great starting point to learn about ADHD and some starter coping mechanisms.
I've just found in general accepting how my brain is, rather than trying to force it to be different, working with what the reality of what I do is, rather than trying to do things in the way everyone does it because that's how it "should" be done.
If you just try to shame yourself into things "JUST DO IT!" it doesn't work AND it makes it painful to look at because it feels like failure heaped on failure, so you'll never figure out what goes wrong. Accept you are already doing your best. Find out what's getting in the way. For example, one early tip that I made up myself: My living room was always strewn with rubbish and clothing. So I put a laundry basket and a wastepaper bin in every room. This was because I knew that I would not stand up and take the clothing/rubbish to the correct room with the correct bin in it. By having a receptacle in the room to use, I didn't have to, and therefore I used it. OK, sure, most people would just put it in the proper bin, so I could have wasted time and energy feeling like a "total slob" and "who is so lazy that they have a bin in every room?" but at least it was contained and then I just had to make ONE trip to the real bin when I was cleaning up, rather than 1000 trips all day.
I cannot listen to podcasts/audio books because my brain wanders, except for when I have my hands and eyes occupied on some mindless task that I do not need to think about. So I use this as a circular thing - I clean, or sort washing, or sometimes exercise (run/walk) while listening to a podcast. This activity means I can focus on the podcast, so I can't cheat myself out of the reward by saying well I'll just listen and not do the boring thing. At the same time, it motivates me to do those boring things, because I really want to listen to the next episode.
There are video lectures by Russell Barkley on youtube which make great audio for this, or when he's a guest on a podcast. ADHD Essentials is also a great ADHD themed podcast. Or just pick a fun one - Freakonomics Radio, Stuff You Should Know, But Why, No Such Thing as a Fish.