今天我将会/打算去再艺术商店. 我喜欢画画, 但我没有美术用品. 我会买油漆/油画颜料, 伸展画布, 画笔, 油漆稀释剂.
Today I will go to an art supply store. I like to paint, but I do not have art supplies. I will buy oil paint, stretched canvas, paint brushes, and paint thinner.

艺术商店change to 美术店or美术用品店,better! if you say 艺术商店，we will think it sell artwork. if we talk about the painting art,like to use 美术。

再=again，oil paint=油画颜料，颜料mean the pigment used for drawing, inculded water coulour ,colour cake and so on.

 油漆always mean the paint used for interior finishthe ,for example :the wall the furniture... ，

stretched canvas=绷画布（better）

believe me, I learn art,haha.

Going to an art store

今天我去一家艺术用品商店. 我喜欢画画, 但我没有美术用品. 我要买油漆, 伸展画布, 画笔, 油漆稀释剂.
Today I will go to an art supply store. I like to paint, but I do not have art supplies. I will buy oil paint, stretched canvas, paint brushes, and paint thinner.

Going to an art store

今天我去一家艺术商店. 我喜欢画画, 但我没有美术用品. 我要买油漆, 伸展画布, 画笔, 油漆稀释剂.
Today I will go to an art supply store. I like to paint, but I do not have art supplies. I will buy oil paint, stretched canvas, paint brushes, and paint thinner.