Hi kodomonino! You can write like this. Long time no see. How are you? Hisasiburi　genki ひさしぶり　げんき？（久しぶり、元気？） hisasiburi　dane genki-desu-ka ひさしぶりだね　げんきですか？（久しぶりだね　元気ですか？） o-hisasi buri-desu o-genki desu-ka おひさしぶりです　おげんきですか（お久しぶりです　お元気ですか） gobusata-siteori masu o-genki desu-ka ごぶさたしております　おげんきですか（ご無沙汰しておりますお元気ですか） Keep up the good work, kodomonino and marlom

Like you I'm learning Japanese,if you're talking to a friend you havent seen in a time you could say "Hisashiburi desu"(If is a close friend),or "O-hisashiburi desu", Should look greater if you say like "hisashiburi desu ne?" (hisashiburi means "We havent seen for a while","Long time we havent seen each other",while the o-hisashiburi means the same thing,but more polite You could put "o-genkki desu ka?"(Are you fine?,How are you?"),or just genkki desu ka? (If is a close friend who you gonna send it.) Well those are basic things about Japanese,i know just a little too,but i'm sharing a little what i know :D Hope you do it nicely!