HELP: Trek 7.3FX Flat Bar To Drop Bar Conversion

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I'm looking to convert my Trek 7.3 FX to a drop bar version and need help as I'm a newbie to cycling....

Was looking at the Shimano 2300 8-speed STI's but that's all I know to go for this far...

I couldn't afford the Trek 1.5 (so the wife said) so had to go for the 7.3FX, but now really want drop bars etc..

Please can anybody help me on what I need ???

Thanks

Peter