Welcome to the forum, lucien. I hope you enjoy the time you spend here.
I'm not going to answer your questions directly. (I don't do applique - I don't like hand work.) What I am going to do is to point you to other places here on Bella where your questions have probably already been asked and answered.
1) QUESTIONS ABOUT APPLIQUE: If you go to the "Quilting Site" here on Bella (the companion site to this forum) Judie has provided several links to the SUBJECT of Applique. It is the first subject listed on the left side of that site.
2) FREQUENTLY ASKED QUESTIONS about using the forum: Above on the right side and just below the Log In/Out is 'FAQ'. Click on that and you will see dozens of questions. Each of them has been answered, so you can find out about images, URls, and others. One answer you will find is that there are some things you can't do until you have been here and posted for a certain amount of time.
Hope I've been helpful. And again welcome. GrannyH
"Life isn't about waiting for the storm to pass...
It's about learning to dance in the rain."