u/Competitive-Yam478

Hey everyone, i am going to start hit gym soon.. IAM M(19) 5"11 65kg... i want work on following things, i would appreciate your opinion on what might work

1. I have very bad posture and my back is pretty well f up due to my worst seating positon from my school life to everywhere...
2. I have no proper strength in me.. i couldnt even handle someones weight when they sit back of me on my back... bike handle would go in random direction sometime.... triples are far worse...
3. Right now i dont have any pretty goals or expectations like abs or packs... i just want to look in shape

ANY HELP IS APPRECIATED