Crypto is very accessible, although some may not enjoy the fact that most legitimate exchanges require access to a debit or bank account and verification of identification to start trading.
To begin, go to Coinbase.com, this will allow you to hook up a debit card and buy BTC, ETH, and LTC directly. I recommend buying 150$ of ETH from Coinbase after following the instructions on the site.
When you buy, there will be a few days (up to a week) time when the transaction is being verified by the nodes. This is the time to start your sign up for Poloniex.com. This site opens up the options for Alt-Coins which are crypto currencies with technology that builds upon the BTC, ETC, and few other architectures.
I recommend sending $50 USD worth of ETH from Coinbase to your now verified Poloniex account (check a tutorial on how to do this or hit me up on FB or Twitter. You should now have 50$ ETH in Coinbase and $100 ETH in Poloniex, minus the transfer fees and any market losses (or gains).
At this point you have a nice chunk in ETH in Coinbase acting as a High Risk Holdings Account. Liquid assets whill flow out of this account into your choice of exchange to speculate on alt coins for additional profits.