Make sure the clone 'took' before you flower the donor, or you'll be left with nada.
To be safe I think you should pinch only the very terminal leaf bud, train the plant, and do cuttings from lower side shoots when they develop. Plus you get way more slips to work with, and believe me, first attempts at cloning often meet with failure... and that is my personal non-expert experience!
A good clone cutting will have a terminal bud, some growth right around it, and 2 pairs of fan leaves, of which you remove the lower ones so that you can bury at least one node. That's the fastest place for roots. So if you want to leave 5 nodes on the plant, wait until is has 8 to top. Just my advice, everyone clones a little different. Now I have to go home and bleach my ez-cloner!!!! Have a good one!