Hey I'm new to that crypto game and wanna make some money

Have bought into BTC and have sent it to bitfinex now and wan't to start trading and investing later.
A friend of me who is in the game for while told me that almost all coins are crap and I should hold only BTC and maybe Monero but not now because prices are still too high.
I'm thinking now about to short Ripple, IOTA, Litecoin and Ethereum.
So my question is what is the most worthless shitcoin that make me the most money with shorting and how low can it go?
$10K is a big amount to "gamble" with altcoins, if you are interested in investment and what not I suggest you start with stocks first, stocks are a lot stable and they do not make you rich overnight but they are not "gambles" that you can lose your money right away, you will have a chance to win some small amounts or lose some small amounts but nothing major like we have in crypto world.
You can read some books that will teach you how to trade stocks from professional retired hedge fund managers that has done this for decades. As soon as you feel like you are ready for crypto because you have done well for yourself in stocks than you can try to research all coins you see and check out what does what and decide yourself.