3v3 Ranked Help with Basics and Climbing

Hello everyone, my name is NightsRAID. Iv'e only been playing League of Legends for about a year and a few months and, after placing B5 in season 6, have decide to take my ranked more serious. I, of course, placed B5 in placements this year, but have taken a notice of 3v3 ranked and 5v5 ranked flex. Being new to 3v3 (I've been able to climb to B3 so far with a decent W/L ratio) and would love some tips or advice on how the 3v3 game typically works, things a new player wouldn't know perhaps? I currently play top or bottom in 3v3 using mainly and a little bit of I run and (or ) I understand that tanks are needed for peel, but can squishies be viable in higher elo? (I plan to reach at least gold ranking in 3v3 so I can pick up those end of season rewards) Thank you in advance (I apologize if this is in the wrong board, this is my first post)