Holly barbless hooks, Batman! You're asking the "near impossible" question, RockinB when it comes to "which patterns to use,to start a new website?".
Which market are you going to centralize on?
Warmwater? Bass? Large or Smallmouth? Crappies? Bluegill? Western Rivers? Western Streams? Midwest, patterns? Or East Coast? Trout? Dollies? Cutthroat? Rainbow? Lake Trout? Steelhead?
Do you tie mostly western versions of the standard patterns, or the sparser "Catskill style"? Dries. mostly, or wets, streamers, or nymphs?
I, truly admire your ambition!! But, today, with a WELL UNDER-estimated 25,000 KNOWN fly patterns available, exactly "where to begin" without FIRST finding your "market nitch" is going to be a near impossible task!
I, suppose, you could either merely "copy the inventory of the successful fly shops in your immediate area" and try and compete with them, or, grab a copy of maybe.......... "Flies---The Best One Thousand", by Rande Scott Stetzer and start tying!?!