1. Well since you have CPU and CPU cooler listed separate i guess they don't come together... You can maybe try to find some used celeron that will sell with a cooler. And 2. for MB if you plan to have max 4 cards it should be fine but if you plan to expand later better go with board with 6 connectors. And 3. PSU with aliexpress..... hmmm well idk i would't trust them with something like that.
thanks for your comment dear
1. i also want to mine with the cpu and thats why i choose core i3
2. thank you for this, i think am ok with 3 cards on this MB
3. i will take your advice, i think i will purchase from amazon
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don't buy the psu it is multi rail pain in the ass junk
https://www.amazon.com/EVGA-Modular-Crossfire-Warranty-210-GQ-1000-V1/dp/B017ICWP82/ref=sr_1_8?
this one above is on sale and can do 3 gpu's
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That is right. Just use the PSU with single rail if possible. If you do not use high power GPU, you can use multi rail.