Should i befriend these ppl?

Well i used to hang out with some ppl like all the time until they all started to change and act stupid. so now i dont leave me house to hang with them in the other complex (its a very complex neighborhood) which i wanna hang outside but i dont wanna be with them. so on the other side of the complex there are some other ppl. im friends with two of them but i really dont know the other one so thats why im writting this.... i wanna try to see how she acts so i can try to approach her and be her friend but idk where to start. am i doing the right thing or should i try? if i should... then how?