Work / Salary and cost of living information - Krakow [257]

Please audience ,
How can a Nigerian Obten a student visa to study in Poland and how is the process and the cost , again when apply how long would it take before I get ?

Thanks for your wonderful answer and advice on my previous question .

Work / Salary and cost of living information - Krakow [257]

Can I find a part time work while studying in Poland , and in which Cities is possible ?
Which public university is better to study Mechanical Engineering in English language ?