I think that it doesn't matter how much you invest in Forex - it matters how much you can earn with the help of it. At your place I would invest not more than $30 in Forex for the first time.
You can transfer to your bank then to Liberty Mutual, they have Forex services at low rates. Or you can jump into a Forex broker such as Forex.com or FXCM.com. use a demo account first to get comfortable with the platform
If you have a trading strategy where you use a tight stop loss and little risk (2% of your account) with high rewards, then yes you can compund that small investment into something larger over a long period of time. I developed a free robot that scalps using a tight stop loss with minimal ris kthat you can get from my site theforexgeek(dot)com completely free of charge, including instructions and set files.
man I have been in internet marketing for long time, the only advice I concluded all this time is never at any cost or thinking chase something that you are not very sure of its good returns in future, so if you think it is good to inevest in forex for whatever convincing reasons you have then go for it.