Just a heads up: you can't earn Bitcoin directly this way. It's true that this can be profitable even with a very modest setup, but a lot of masternode coins are scams. Initial costs are also usually expensive enough that you might as well buy a mining rig setup if it would be profitable for you.
If you build a mining rig(GPU miner) these days it is not profitable if you live in the country with high electricity rate so this is also not recommended as the alternative.
However, if you are targeting to make more profit ASICminer can be the best option because it is more profitable compared to GPU mining.