Just started playing Baldur's Gate EE.

Hello reddit, i just started playing today after tons of research about how to create a good char.. im playing android version, looks fine so far.

So, i rolled (for hours) and got a fighter with 95 total stats and 18/86 str.

It looks like pretty decent, i want to play as a fighter/cleric. what level should i dual to cleric? How can i do that? i've seen the option at character menu but it's greyed out.

Any kind of help is nice, thank you.