What a great job - much respect - to you
I hope to aspire to the quality that you have achieved - mucho impressed with your skills!
Appreciate the comments Tony! You'll find several examples of excellent builds in this section of the forum as well as links to building techniques and plans. Ian has links posted at the top of this section.
how hard was the stiching? - how much overlap did you use between panels? - did you glue the seams before stitching?
so many questions..... so little time

I look forward to seeing your next build:D
again GREAT JOB - be PROUD!

You need a good machine and some practice time. There is no substitute for either. You get good with practice on quality equipment.
Panels are taped together with double sided tape 1/4" wide. Sewing the panels is actually one of the easier steps. The initial taping takes more time than running the fabric through the machine.
If you are serious, read all the links mentioned above. Attend a builders workshop if possible. Invest in a good machine, several models are recommended for kite building. Find some plans for a kite you want to build. Buy enough material for at least two kites and plan to make some mistakes at first. Part of the process

After this project, I have even more respect for the master builders out there.