About how to manage money

I haven't talked to you in a long time.
After going through a previous relationship, I'm now happily dating a man I think is more important than my heart.

However, the other day, we had a big fight over money. They made up, but he said he wanted me to manage his money because he wasn't good at it.
He seems to be saving money, but since he gives me all his money (date expenses including meals, and even clothes and shoes), I was worried about how to spend half my money happily.

Marriage is a prerequisite for the time being, but I thought it would be nice to say anything about people's money or how they use money...

However, since I was entrusted with managing my money, I think it might be a good opportunity.

As for what I want to do
① I want to set goals for the future of the two of them and save money (wedding expenses or down payment to buy an apartment)
② Make a date with sharpness
The meal you eat on your way home from work is pretty good, you eat breakfast at a family restaurant, go to a hot spring facility right away, and even if it's a date you think of, the cost of one date is high.
They suggest dates that don't cost money, such as picnics with bento boxes, etc., and carry them out, but they haven't reached abstinence easily

I would like some advice on implementing money management.
By the way, I don't know his savings or income
(The income is from the same job, so it's hard to imagine...)

It's important, so I don't want to fight again in the future, and I'd like to think about it together.

Thank you for your kind attention.