I prefer... I will be much appreciated if you... Please do.... I'd like ....

"I'd like you to do something," "I'd like for you to do something," "I'd be happy if you did something," "PLEASE, DO SOMETHING!" etc... you have lots of options for this one. What's the context? That will help get a better answer.

Many people say things like this to their friends, "I'm moving on the weekend. Can you give me a hand? " or "I was wondering if you could do me a favour? I'm moving on the weekend and I'm looking for some help". If you are talking to a stranger, some other alternatives might be, "Excuse me. I need some help. Can you please tell me where the bank is?". Hope this helps