Good for you for recognizing that your son is ready to begin potty training! So many people assume they are too young and then they miss the window! Prior to 1954, 80% of all children (including boys!) were potty trained by 18 months.
The first step is for them to recognize Wet and dry. Now that he knows that, you need to help him learn where the pee goes. He will quickly get the difference in what it is called if you just keep correcting him (my daughter mixed them up at your sons age too). I began working with my daughter around 17 months and she is now mostly trained during the day -2.5 months later, with her going consistently on the potty for 6 weeks. We even went to Brookfield Zoo yesterday in training pants, and she loved their little pottys for toddlers. No accidents either! I got my daughter to go before bed on a regular basis first, and then we added nap time, and then we just instituted a full on schedule --after breakfast, before we leave the house, when we come home, etc. I highly recommend buying a Potette Plus potty for when you are out. We've used it in parking lots multiple times in the past week and it is fabulous that I can respond quickly to her need to go potty. Easy (and clean) too!
What we did was do a 15 minute play session every morning in the bathroom, with her naked. So my first suggestion would be to get rid of the clothes, and have him pick out a few books to read in the bathroom with mommy. I don't think it matters when you do this play session. The most important part is to get a habit going that we go to the potty after X, and then, you need to end the session by going pee yourself and telling him what is happening. He doesn't even have to sit on the potty. It is also helpful if you pick a time when he might be ready to go, and then, when he goes, just quickly put him on the potty telling him "pee goes in potty." Just make it FUN --this will help motivate him and really peak his interest.
Go get the book Potty training Your baby by Katie Pelt from the library. I also found Early start potty training helpful. Both were at the Wheaton Public Library.
Good luck! And again, good for you for recognizing that he is ready. Be prepared for some truly frustrating days (just don't show it), and be prepared to put in some time. You can't really do a three day boot camp with a 17 month old, but if you start working now, your son can be fully trained by 2!