First off, I don't think you're looking for investing capital but trading capital. If you plan to trade intraday then that's not investing.
You seem interested to raise capital to start trading on your own. Now, I'm assuming you want to go it alone and not a be a propietary trader. If you are a beginner you don't need much, start with $7k-$10 in capital, get IB as a broker and sign up with a chatroom like Mtrader, Pristine, etc so you can learn how to trade.
If you are desparate to trade with such a large account ($50k -$100k) and want to go for broke (because you are setting yourself up for failure), take out cash advances on your credit cards, get a home equity loan with a lien on your house, sell the car so you wont go anywhere, or get married and sell your spouses stuff. I wouldn't do any of these and would highly suggest you don't.
When you trade you also have to think about keeping costs down. You have to be not only aware of the revenue you generate but also the costs which both make up a good business. To trade with $50k-$100k you have to earn that through experience. Start out small with $10k, and if you are good like most experienced traders, you will have your $50k-$100k in no time.