If I'm honest history is the best place to learn from. You can trade trendlines, fibs, support & resistance in many different ways but nothing beats back-testing and pouring over the charts than actual trading. For me the biggest problem beginners have is confidence in their method. Without confidence you will be tempted to tweak and change things as your beliefs about the market are open to external influence, they aren't rooted. Once you have your method refined and your rules are fairly mechanical start trading a demo account for 3 months. If that goes well trade say 25% of your capital for another 3 months. Keep adding from there. If you follow a method that is more discretionary you'll probably struggle.
To build your method pull up a 10 year history in MetaTrader for GBP/USD. The more data the better. Devise a method based on what you know, and apply the rules religiously to each signal on that 10 year history. Capture all the trades along with screenshots showing entry, drawdown and exit in a spreadsheet. You'll need to shift down to lower timeframes to ensure you didn't get whipsawed out of a move where a candle spans your entry and stop. Analyse the trades - where's the best place to put your stop? did you move your stop too quickly? would a trailing stop to BE help? how should you move your stop? are there obvious places to take profit? does trading with the trend help? how extended is the market when you enter a trade? which signals are the best performers? are you comfortable with the drawdown on your given risk profile? how long do the drawdowns or barren periods run for? Also factor in slippage and financing. Now do this again for the other majors. I know it takes time but nothing else will give what you need. If you've already read some of TD's thread and J16 then you already know enough. Stop looking any further.
Some notes about how I trade. I've found that trailing my stops to BE doesn't really improve my results (very marginally) but it does reduce my drawdown. I've also found that taking profit at 1 or 2 * risk reduces my drawdown, which I'm more comfortable with, but in the long run it significantly reduces my profit. That's just my psychology and what suits me. I thought I would give riding the drawdown a go when I started this journal but after a 11% drawdown in the first 3 weeks of June I quickly slipped back into what I would term aggressive trading! Note that by taking profit early I am actually trading two methods. One method has reduced drawdown and reduced profits (but is more consistently profitable) the other method has exceptional profits but drawdown in the region of 35-40% at 2% risk during barren trading periods. I don't want to post past results in this journal as I don't want to make it look like I'm cooking the books. After a few more months I'll have enough data to begin to demonstrate these effects.
So, there is little more you need other than a starting point and time. I think TD describes support and resistance very well along with price action. I don't trade price action as it doesn't have an edge and thus requires discretion / confirmation, which TD highlights well. For trendlines you can try short term trends or 1-2-3 entries in the direction of the trend and a trailing bar or trailing swing stop. Here are some example threads -
http://www.forexfactory.com/showthread.php?t=54528
http://www.forexfactory.com/showthread.php?t=80290
I haven't read many threads that offer excellent advise but it's usually only the first 2 or 3 pages you need to read. There are no secrets in this industry only those with patience and discipline and those without.
I'll throw this out there too. Forex is the most liquid market in the world. More $$ are moved in Forex than all the stock markets in the world combined. There isn't anyone here who couldn't devise a profitable strategy on EUR/USD daily timeframe. Whilst the large speculators (hedge funds) have the leverage to move the market over shorter timeframes the vast majority of the time it's central banks, governments, global banks, regional banks, large funds and large multinationals that are moving the market for other reasons than pure speculation. This appears on the daily, weekly and monthly timeframe. They have nothing against you or me and they are not out to get the retail punter so there is nothing to stopping anyone from becoming a trader. Even captial can be aquired with a good track record if you look hard enough.
Wow, that post was longer than I inteded it to be!