Upload & Sell: Off
You pictures are pretty good for a first try: good action, shooting low to the ground, sharp, well cropped, clean backgrounds. Congratulation.
Regarding the Facebook vs. Shutter-Fly, I am not sure what the issue is with your Mom, but one thing I would encourage you to consider is the privacy of the players.
You are taking pictures of minors and some parents might object to you posting pictures of their kids on publicly accessible web sites (including - and some would say especially - Facebook).
When I shoot a kids event, all the pictures are stored in a password protected gallery and the team manager is responsible for sending out the password to the parents (Call me old fashion, but I am surprised that people post kids pictures - of kids other than theirs - on this forum...)
If you want to promote your portfolio and service, you are probably better off having a photography web site that you use as main destination you want to send people to.
For example, here is what I do:
- When I am done processing and uploading the pictures to my photo hosting service, I send the parent an "event Code" for the game I was hired to shoot (for example 111022-32) and tell them to go to my website (www.widgic.com) and enter the event code in the appropriate box in the landing page.
- The landing page has a big slideshow of my portfolio as well as a menu to get more information about my services / contact me / etc... This way the first thing they see is my portfolio and if they are interested, they can learn more about me, and contact me directly from there.
- Then they can enter the event code in the box, click on "Go!" and it takes them to their event gallery (again, password protected for kids events).
Hope this helps.