I'm going to start re selling thing, where should i start?

Okay so i have items new (phone cases, chargers, clothes, etc. )
but i don't know where to exactly start
instagram or twitter or ebay or amazon? I want to be local maybe but ill ship if i have too.
& how much should i list items for?
example would $8 be a good price for a new iphone 5/5s/5c charger that is 5 ft.
everything would be new
shirts price around $5 -$10?
i want every thing to be at a reasonable price.

Craigslist maybe? Also there are a few yard sale apps I believe you can also post just random items on. There's also thread flip which is an app that is for clothing only but you can sell things in seconds, though you will need to ship.

No place
do market research
write a biz plan

and then, likely, STOP
you will likely be easting those more than selling them

you are not describing a business but a sloppy hobby

In the phone accessory markets, you have many competitors like: http://www.depot4u.com/iphone-4s55s5c-case-c-225.html, in this sight, you even have a low competitive because of their cheap and quality
So online business is not a good choice for you.

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