hugsathome,
Ginger did a wonderful job of giving you truly excellent suggestions. When reading your post,I was thinking back to my own first-born son, as I used to tell my hubby that if we'd ever sent him to school they would have had him tested for ADHD in kindergarten/ 1st / 2nd / 3rd grade and he would have qualified! After birth it was as if he'd been shot out of cannon! (I know this is true, as I used to refer and fill out the referral forms for kiddos in my own public school classrooms for years, and he would have been a sure thing)!
As kiddos get older, they often settle down some, and also learn to cope better with their various areas of strength/weakness. My oldest son is now in 7th grade (aged 12 turning 13), and the difference for him in grades 6-7 has been quite marked! So, I'll encourage you that time is on your side.
My second son is more of a highly distracted child, unless he really gets into his task. Then, he's a single task child, who cannot be interrupted (or even hear anyone else it would seem)!

I have to strive not to repeat myself with him all day long! Focus is his hardest issue!
My third son used to fall off the couch during our lessons several times a day, just because he was such a squirmer. So, I can empathize!
Next, there's a few things we've found to be very necessary for this type of learner:
1. Short lessons (15 min. or less)
2. Vary activity with oral lessons with written work
3. Do the most difficult thing first or second in the day (to get it out of the way)
4. Set the timer and put it by the child (an electronic one works best as it doesn't make a ticking sound)
5. Sit next to the child for their hardest subject
6. Have a quiet room for working (keep them away from t.v., telephone, computer sounds, talking, pets, etc. as much as possible during work time). At our house, this "quiet room" rotates to wherever the rest of the people are not. We also have my older son read in my bedroom (rather than his own, so he won't be distracted by his playthings, books, etc.).
7. Break up the day with recess, lunch, computer time etc. so their work is not all in a row
8. Touch can help some kiddos refocus. For example, if your kiddo is daydreaming, instead of speaking, just walk past him and rub or pat his back. This helped mine refocus and get back to work. I also will sometime walk by and just point to the timer, without speaking, to draw his attention to that as a means of refocusing.
Anyway, I know more moms will be along with their suggestions for learners with distractibility. You are not alone on this, and boys seem to have it even more than girls. Almost all of the boys in my third/fourth grade public school classrooms were this way too!
Blessings,
Carrie