I'm just guessing that you are planning you and your friends trip, so you have to say "i will plan me and my friend's trip" instead of "group my friends trip". In english we use different words for adjectives if we take choose for an example. "Choose" it's not decided yet, "Chose" it is decided. Staff is a worker and stuff is more like things. Instead of "somewhere we can sitting on" you can use "somewhere we can stay" otherwise its like bringing a chair to sit on. But then I also have a question did you mean that you wanted to pack your luggage or did you mean that you are going to write it down to pack in another occasion?