For day trading your costs will run $80-100/month for real-time quotes. Currently you get emini quotes free and don't have to pay the additional CME real-time quote exchange fee of $60/month. That will change in a few months.
For startup costs, the usual applies: charting software, trading enviornment, etc. QCharts is free when you sign up with quote.com, but it only has minimal charting/indicator abilities. For some traders that is enough.
Depending on your trading style, you may want to have a backup quote feed, workstation, etc. Some day traders have two DSL lines, others are fine with modem dial-up as a backup. If you always have a stoploss on your open positions (rather than using mental stops), then you lose your connection you're not as much at risk.
If you're only looking at end-of-day trading then your costs will be a lot less as EOD data is freely available and EOD charting software is usually cheaper.
For brokers, see the broker section for pros/cons of different brokers.
Regarding news feeds/books, if you're still wondering if you need news feeds or which books to read, I would recommend a lot more reading before jumping in.
