Hello,as per your concern you have acne prone oily skin and open pores.
Open pores occurs either because of injury(pitting scars of acne) or excess sebum production.
You can follow instructions mentioned below to cure it
1.Use gel based cleanser.
2.Use alcohol free toner or rose water.
3.Non comedogenic moisturiser.
4.Retinol based cream alternate day.
5.Gel based sunscreen.
Next Steps
You can consult cosmetologist or dermatologist
and can go for peels,radiofrequency treatment or even laser if it doesn't get treated by all these measures.
Health Tips
you can even use good pore minimizing serum,egg whites and don't go for steaming of face as it will further aggravate the problem.
Try to limit foods which has high glycemic index like potato,milk etc