Excellent source & selection of seedlings that are raised / trimmed for bonsai -
www.evergreengardenworks.com. Brent also has great informational articles on that site & often chimes in helpfully on this site. Tools - our own Treebay's site -
www.treebay.com. Generic pots (as opposed to artistic 'one of's that you'll find via potters posting here), tools, etc. -
www.bonsaimonk.com Same (but pricey) and add magazine (Bonsai Today - recommended) & books -
www.stonelantern.com
That'll get you started....
Usual disclaimer - no commercial connection other than Happy Customer.
