There are many resale shops that sell used designer kids clothing if you are interested. The ones around my area are called twice-but-nice and once upon a child. I am sure you could find some in your area if you just searched the internet for used childrens clothing.
Absolutely. As long as you don't represent the mattress as being new it is most certainly legal to sell a used mattress.
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Yes.
Justice is a clothing store which only sell clothing for girls. You will not be able to purchase clothing for boys at that store.
eBay is used to sell new, used and antique clothes as well as clothing accessories.
You can sell a chefs coat on the internet or at a used clothing store, depending on the quality and make, the price would be best to go to a clothing store.
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Look for offers in different places to sell clothes, don't limit yourself to places exclusively for children, you can go garage sale, many bales of clothes are in very good condition, use colors that are easy to combine, so that you can make several from one piece looks. Create a network of moms who have daughters the same age or older than your daughter so they can sell or give you clothes.
The best place to get used clothing racks would be a clothing store that is be closing down. They will often sell off store fixtures in order to recoup any profit that they possibly can. You can also talk to department stores that sell large volumes of clothing - often they will replace old or damaged racks, and may be able to sell or donate these to you, providing they are still useable.
Yes, it is legal to sell rudraksha. It is type of seed that comes from an evergreen tree and is often used to string for jewelry. It most commonly used to string prayer beads.