It all depends on how good you are mate!
All non-automatic trading systems can be thwarted and made to fail by the user breaking the rules. So which ever commercial system you choose you have the ability to screw it up.
Since you mention the FTSE100 (UKX) I assume you are in the UK, that means that a good percentage of the trading signal systems are no use to you unless you are a vampire or other nocturnal creature. Even the G7 system which focuses on the Europe session is based in South Africa and is 2 hours ahead of the UK so when they post their first trade at 07:00 it's 05:00 in the UK. If you miss it you are then in a difficult position, If the move has started you may catch half of it if you are lucky but where do you place your stop?
If you have not already worked through all of Babypips.com training pages please go and do so. Then read all the free stuff from surefire-forex-trading.com
Then read about Elliot waves. Then sit and watch what happens. Look at charts and see what is happening and why. Read Felix's story and method on this site, understand that events will happen to create the elliot waves, many of them predicted by the events calendar on this site. (Also see the Forex factory calendar which can be set to UK time) Watch the daily news trading signal, dont just read it. Make sure you understand what Sir Pips is saying in the videos. Be aware of the financial and political world, if you are in the UK buy Moneyweek magazine.
Paper trade ONLY for 6 months.
Lastly if you want to trade the FTSE look at the long term chart back to 1960 ish and you can see the supercycle. When you look at that and project some trend lines you will not be at all surprised at the FTSE falling, you will also see that it may very well go down a whole lot further in the next 2 or 3 years. Or it may go back up in a year (Looks like a flat in the supercycle)
Regarding forex pairs you will see how very closely in time most of them follow the FTSE (UKX) and the Nasdaq (INDU)
I now use STAR by Cyclon and am learning slowly, having been wiped out twice.
You will see new threads start in the personal trading section, it is interesting to see how long they last, having arrived with "sound and fury" claiming vast profits. Unfortunately the ones I really want to see from 3BC and Pharaoh are not posted. Cyclon was silly and posted several trades from a new system/indicator hes was developing instead of the established one he sells, consequently he had 3 srikes and was out. But his main system is unique and very good but as I said at the start you need to follow the rules. PipBoxer is a mechancal system I think the still posts regularly.
But most of all you must practice and paper trade until you can read charts and get inside, and win consistently. Email me if you want any more sources for info. Do not jump in, you WILL loose. 95% of traders loose overall.
The cheapest option may be just to send me all your money,I could save some of it for you by not trading.
cheers!