1) How do a girl get into a temporary marriage what is the saying?
2) Is a dowry needed or can they just specify time?
3) How do you write it in Arabic?

1) She says to him: Your wife myself on the dowry of $ 10 – for example -, for a week – for example –
And he says: I accepted

2) Yes. Dowry is needed. Both time and dowry is required

3) You can recite it in English:
I marry you my self on a dowry amount of…. for the period of ……….
He says: Accepted.