alright after i post about the USB mining many people advice me to buy ASIC
Where are you buying it?
is there a tutorial for it?
To cover electricity and see some good earnings how many i need as a start?
I think it's better to start with one miner first, you will be able to learn how to configure the miner to a mining pool like Nicehash or others, for a newbie it will first look impossible, I will share you a YouTube video where you can watch and learn, and you can also watch many others on YouTube, just type what type of video you want and you will get tutorial videos.
https://youtu.be/RNCXULhef74
Since others have tell you about bitmain's official website I think that's the best place to buy your Asic miner, they have a warranty too.