Please help me (Japanese)

Hi 4chan,

I would like to speak a few simple Japanese sentences and really need your help. I tried online translation tools but I need the romanized words to pronounce it.

Really appreciate any help. Please help me translate these:

Hi, this is a gift for you. I hope you will like it. Happy valentine's day.

yes, he's probably just used to using si for japanese and too lazy to enter the h in there.

oh and lol at ecchi s[h]itaina

however, I don't think 「konnichiwa, kore wa kimi no purezento dayo」is really a good translation but I guess it could work, doesn't say it's from you or anything either. Now I know what I'm about to say is probably wrong but I'll try it anyways.
watashi no purezento wa kimi ni agemasu
If I made a mistake, feel free to fix it for me, so I see what I did wrong.