In collecting and selling that collection I think it takes passion to enjoy and, a lot of research, along with a realistic view on what you have.
Buying of these types of goods are almost always emotional in many cases and worth only what someone will pay for them.
If you really want to get into collecting perfume bottles, start reading up on bottles that people want. Go to some high end auctions and just watch which botttles are sold and for how much. Go to museums to look at the bottles they may have on hand. Go to estate sales, swap and shops, and garage sales, and auctions like storage auctions for sure.
Sure you might find a deal on ebay but usually its not without a lot of legwork, which is time you have to account for in the sale price of anything you sell.
When you work on your own you have to account for all of your time (rearching, going to estate sales, etc) so that when you sell something you are paid for your time. Otherwise you find that the 225.00 item you spent months researching and buying and reselling basically netted you less than what a person minimum wage would make if you account for all you put into it.
So I think you should be realistic and practicle about the time and effort put into it, and the money netted out of it, if this is what you want to do. Do it as a side thing in addition to your normal thing, which is what most people tend to start with. If you find you can make it a full time gig, then sure do it at that time, but don't start off that way unless you have unlimited funds to start big.