Many have posted that Crazy Angler is a good source for Sickles, which might be all you need for fresh water applications.
Not saying you should, but if you want to get Fed & State excise tax licenses, you can buy from Shorty's Hook Sales which supplies at the mfg. level by boxes of 1,000.
For the Feds, unless you can justify your enterprise as a "hobby" rather than a "business", you are required to apply with the IRS for an EIN (Employers Identification Number) even if you are just a one person home bizness which is your ID to pay the 10% of gross sales excise tax on sport fishing tackle. Once you have that, you can apply for a form 637 which is an exemption for the 10% excise tax often passed on to you from component suppliers like Shorty's.
OK, looking forward to what suggestions you'll get for molds.