How much money needed to invest for entry level bitcoin mining ?

Right now, you'd need to buy a power supply and a T9+ to mine BTC. Would cost you about $2,300.
https://shop.bitmain.com/productDetail.htm?pid=000201801301302128506gKIcpoR06AA

you cant mine ethereum with 1050 ti try mining ubiq or some other coin.

Im using nicehash site
is that okay ?

Yes.

Thanx for your answer mate