You didn't really give much detail about what position you would be doing but here's what I can gather, If any job seems too good to be true, it always is. Any job that offers a good salary often requires extensive interviews and knowledgeable about the actual position. Furthermore, the company should be fairly easy to find online, small business or not. Remember that it's still an employer's market. They don't need to sell you about the position, you have to sell yourself to them. If a company spends more time talking about why you should work for them instead of about what YOU can do for them, that is a red flag. If you can't find any information about them online, that is another red flag for sure.
There are many companies out there that scam potential job hunters by being both deceptive and very discreet. One example is jobs in marketing. Many people would like to work in marketing so when they see a job posting that promises the moon, they get all excited; especially the fact that these jobs claim you can make a ton of money with no experience necessary. When those suckers go in for the interview, they find out the so called "marketing" job is in reality a cold calling or a door to door sales position that is one hundred percent commission with no benefits. My advice for you is to just be careful and go with your gut. If you really want to know what is going on, ask as much questions as possible but just be aware of the many job scams out there. The most sought after jobs usually are very specific in detail and require an in person interview.
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"The less I know about other people's affairs, the happier I am. I'm not interested in caring about people. I once worked with a guy for three years and never learned his name. The best friend I ever had. We still never talk sometimes."