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Your basically need to have a comfortable place to work, avoid working from a computer desk or sofa you tend to get a bit relaxed and lazy, beds are better, futons tend hurt more on the body.
Lighting 100 watts is best, its trial and error to figure out how to position the lights to ge them just right. it all depends on how many lamps you will need, it varies depending on how many colours you have in your background set up and also skin tone of the model and what is wearing, and also the type of camera you are using different webcams and video cameras show different quality of colours.
Computer, anything about a p3 is good, some webcams studios run them on the bare minimum when I was running a studio i had the girls on 4 gig harddrives just enough to run windows and the webcam platform.
There is many ways of connecting your camera if its a video camera you plan on using one option is getting the Osprey Capture Card is good if you want your camera connected directly into your hardware, alot of the Sony-EVI camera are connected that way, I connect my camera using a product from dazzle aka pinnacle, a video capture usb device and you can also connect your camera using a tv turner. again all these options are trial and error. if your using a webcam you want to make sure you get the webcam that has high quality lens and also over 2 mega pixels. if you can get them higher that is great.
Internet speed go with a package that is above 3 mbp high speed internet . the higher you can get the better