It's gonna be tough, but I am going to try my best to answer as much as I can! Assuming that you can't read Japanese yet, I am going to write them in Romaji (Japanese in English characters). Also, I will write all of them in FORMAL Japanese, the kind that you will be using with people you don't know or meeting for the first time (since I saw in your profile that you like to travel and thought that you would meet new people all the time!)
Since there are word limits for each answers (2000 characters per answer), I am going to write them in 2 parts.
Part 1
________
2. What's up?=> "Dou shitan desu ka?" (in case you want to know the informal of this one it's=> "dou shita no?")
3. How are you?=> "O genki desu ka?"
4. Where do you want to go?=> "Doko e ikitaidesu ka?"
5. Are you hungry?
6. Do you want something to drink?=> "Nanika nomi masu ka ?"
7. What do you want to do?=> "Nani o shitain desu ka?"
8. How far is that?=> "Sore wa dono kurai deshou ka?" [<-I'm not very sure about this one though!]
9. Did you work today?=> "Kyō wa shigoto shimashita ka?"
10. How was work?=> "Shigoto wa dōdeshita ka?"
11. Do you need anything?=> "Nani ga hitsuyōna no deshou ka?"
12. It's beautiful today isn't it?=> "Kyō wa utsukushii desu ne!"
13. Do you like...?=> "...ga suki desu ka?"
14. I'll get it.
15. Do you live nearby?=> "Chikaku ni sunde imasu ka?"
16. Where are you from?=> "Doko kara kita no desu ka?"
17. How do you like...?=> "...wa dō desu ka?"
18. Thanks.=> "Arigatō". *Thank you very much=> "Arigatō Gozaimasu".
19. I appreciate it.=> "Kansha shite imasu"
20. See you later.=> "Mata ato de". *Depending on situations there are more ways to say this.
21. Have a great day.=> "Yoi ichinichi wo"
22. What are you doing tonight?=> "Kon'ya, nani wo shimasu ka?"
23. What are you doing this weekend? "Konshū-matsu, nani wo shimasu ka?"
24. Do you want to do something?=> "Nani ga yaritai nandesu ka"
25. How's it taste?=> "Aji wa dou desu ka?"
26. What do you do?
<...continued>