In your example sentence, you can use 『会』for future tense: 『会』= will (do something) "I am going to visit my friend." 我会去看我的朋友。

there are several words you can use when you want to express the future tence . these words are :要、将、会、将要、马上、就要、打算、准备、计划 etc. in the sentece ,they are usually right after the subject . for example : 我要走了（i am going） 他将于六月份结婚（he is gona to get married in june） 天就要下雨了（it's raining soon） 我马上到（i will be there very soon） 我打算（准备/计划）明年去北京（i plan to go to beijing next year） sometimes we can express future tence without any "future tence words" when you put the dates or time in the sentence. for example: 他明年回来（he will come back next year） 我后天走（i will leave the day after tomorrow）

我要去看朋友.

决定 is also pretty useful: to decide (to do something) / to resolve / decision / CL: 個｜个, 項｜项 / certainly 我決定要去看我朋友-- I've decided I will see my friend--

hui means can? but we can use also jiang ....lai...for future tenase.