The BP course will certainly help you understand the basic mechanics of trading like pips, leverage, etc but there are some other things that are worth thinking about at this early stage.
There are many ways of trading FX (and commodities , indices, etc) and you will need to define what kind of trader you wish to be and what you want to trade.
This is partly dependent on your character and partly on your circumstances. Some traders sit in front of a screen and trade off what they see on minute-based charts, others only look at the daily charts at the end-of-day and others on anything in between.
You will need to consider how much time you can devote to trading, do you have a 9-5 job, for example, when can you access markets. You will also need to consider how much capital you can afford to put into your account. For example, there are threads here on BP about the difficulties of trading small balance accounts. You will also need to think about whether to trade a range of products or specialise in only one or two.
Another area that you will reach in time is how much you want to mechanise your trading and how much you wish to add your own discretion to decision-making, how much you will rely on technical analysis of price movement and how much on fundamental analysis of the currency’s underlying economy, etc.
You should certainly open a demo account to practice and experiment with different approaches and instruments. But do not treat your demo account as a computer game and just start chucking huge positions around on a play account.
Your demo account is a serious instrument. It is a trading simulator and you should aim to use it to systematically define how you wish to trade. But, as has already been said, trading a live account in the real world is a very different ball-game.
These are just a few pointers to think about! Good luck…