Hello Luana
I´m also from Brazil (live in Saquarema) and agree with Piros suggestion... a 9'8" for a beginner is pretty small, you will have a hard time to learn. My SUP is a 10' with a round squash tail as your friend recomended, shaped by Chatii from São Paulo, very good board. If you wanna see it and to compare prices, send me an email and i´ll send you some pics of my board.
[email protected] Um abraço
Ivan