Yeah, they are right, I just made some modifications to make them be better. 2。 66号公路以前是一条从芝加哥到洛杉矶的重要公路。(killed the 的between 重要 and 公路) 3。 第一次他们看到一个彩色电影，他们其实觉得是真的。（彩色电影 is right，if you said 色电影, it will lead Chinese to think it is blue movie) 4。很多人进入过那片森林然后再也没有出来。（you forgot this sentence)

Presentation

早上好大家（大家早上好is better)。我姓李，叫李威。 ,我是秘鲁人。我是机电工程师 (actually this sentence is right, but not very good, 我来自秘鲁，是一个机电工程师 is better. double 我是，let me feel a little strange)。现在，我(在)学习汉语。
我喜欢听音乐，看电影和玩电脑游戏。我希望结识新朋友。对不起，我的中国(水平)低 ^^

 

 

Your Chinese is very good, I can understand all of it, my modifications just make in accordance with Chinese language habit, but your sentences are not wrong.

 

May I know how long you have been learning Chinese?

 

 

It's very hard to give a complete meaning of just a 处, it has different meanings in different phrase. such as 相处 (get along with each other)，用处(application)，地处(location)，处境(situation) etc. there are too many meanings, even such as 处朋友