Here's some advice from an intelligent player:
- Don't be an idiot and stake, flower or dice your money away. Earning 1-50m is a lot harder than earning 50-100m.
- No, staking in increments will not make you money. You're just as likely to get cleaned as win 50m. Very few people on here have any knowledge of probability.
- I have done exactly what you have set out to do in 15 days of flipping for half an hour a day. I started with 45m. I now have 95m. It is possible, and the newest update makes it slightly easier as there is less people flipping.
- When choosing items, head to the Grand Exchange wikia page, look at the buying limits per 4 hours and choose an item which you know is commonly traded (e.g mithril bars) and flip them for 15-20gp. The buy limit is 10k and so you will make 150-200k in a matter of minutes. Occupy all 6 GE slots with this and you're making 1m per 10 minutes.