Nice on your move to accumulate bitcoin now that we presume that it's on the low level range.
But I really don't like trading bitcoin if I don't have upto $1k capital and above, I'm this type of person that will want to appreciate any  profit I got on any trade and in order for that to happen I don't go trading bitcoin with little capital, instead of that use ur $100 - $1000 and look for low gem coins and buy. You can split your capital into 3 projects and buy once it moves up, you will definitely appreciate your profit, rather than buying bitcoin with $500 and in one year you haven't made $100 profit.