Well TimDog, you are asking pretty big questions that have got books-worth of answers. Have I seen percentage stops? Sure I have and imho they are for investors, not traders. How do you place them? One course I got years back recommended a standard 10% stop. You can get smarter and do like you are thinking of and estimate what the average pullback is and use that - but what skill is there in that? Certainly not trading skills!
Next, where to exit based on price and indicators? Phew! Reading price action is a real skill and then a little bit arty as well. The same can be said for indicators except you need to learn by experimentation how to set them up so they talk to you and very few have mastered that; so few that it's a common theme in ET that it can't be done - indicators lag is the mantra.
Let's start with the easy bit. I'd suggest you learn price action signals using Candlesticks. There's loads of websites that offer free information and search ET. This should knock the percentage stops out of you
You need to put this in a framework of Support & Resistance and I've covered some of that in this thread. Also read all the posts in Interesting Charts thread as many of those techniques will work in a bigger timeframe. Again check S&R threads on ET.
When you have a reversal signal based on Candle Pattern combined with S&R you will have learned to place your stop just outside the signal candle. Every reversal candle pattern has stop placement as part of the signal.
What other things do I look for? Quality of movement ie fluid price action where the candle bodies don't overlap so one body starts where another ends. Overlapping bodies is not so clean of a move and is not the place for you to start.
How to use Stochastics/ MACD for exits? If you learn price action your normal settings for these will indeed lag. Treat these as telling you when they are in the place where a reversal is more likely - then take the candle signal. The actual indicator signal will follow your trade in most cases. Check Goinglite's posts in Interesting Charts for more using CCI.
Earlier in this thread I demonstrated using Bollinger Bands for S&R and trailing stops for exits and entries. Now it's time for some real hard graft and loads of time and effort on your part. Be prepared to spend thousands of hours learning your craft - it's part skill, part art and mostly time and money that you need to make it big time.