Plan 1: Buy BTC and ETH only. Spend $50 and buy 50% BTC and 50% ETH. No schedule and buy on dips.
Plan 2: Buy BTC, ETH, and LTC. Weekly, regardless of the current cost of each coin. Alternate between coins so 1 week buy 50/50 BTC and ETH. Next week buy 100% LTC. Next week buys 50/50 again.
HODL both obviously.
Also at what point is a hardware wallet required?
It;s really hard to tell which is gonna end up rising and little bit decreasing most of those coin you've mentioned mostly ethereum is the best way to make a good profit weekly if you're planing to hold that for long then you can easily buy bitcoin with your income in eth mean while in ltc well regardless of coins prices you must think the way of on how you can make a good profit from it and to not a bargain of a single lose from your previous investments you can easily take a look at the graph in each market of what best to buy weekly.