Keeping it simple, talk with your daughter. It's never too early. Engage her in questioning the stuff she does, the stuff she sees so she'll grow up able to unpick things, not just take them at face value and make at least more informed decisions for herself.
Take great care in making the choices you do for her. Childcare, health care, play, toys, games, reading material, friends and associates, family outings, etc. Think about the examples set by the people involved (if there are people) and the messages she is likely to gain from being involved and/or using the item.
Set a good example of how to be loyal to your humanity rather than your manhood. Be aware of gender stereotypes and don't collude with them. That can be harder than it appears because these are so much the "wallpaper" around us that we don't always notice, but try hard. Examine your own choices, why it is that you make them and how that "looks" to your daughter. As someone said above, vow not to consume porn or collude with sexist words and actions of others, and challenge these wherever possible. Live the values.
Acknowledge that our patriarchal institutions, traditions, societal values, economic systems, etc. will be sending out a very different message from you to your daughter, relentlessly. Accept that you can't shield her from that all the time and certainly not forever, but do what you can to minimise the impact as much as you can. There will be people you care about who don't "get this," and don't see the damage of commercialisation and sexualisation of children - may even be cheerleaders for it. Where possible, challenge and question them on what they do. She's your daughter, it's in your gift to refuse a gift that you feel is not appropriate. Explain your reasoning but don't expect that everyone will understand. They may have their own reasons for not rocking the patriarchal boat. Talk with your daughter about stuff they say and do though so she won't just feel she has to absorb it without questioning. Consider whether you can do without some "friends" who don't understand or accept your view - often they can be hard work for little reward.
Recognise that she's a person in her own right, and she'll make choices of her own - more of them, the older she gets. She'll make mistakes. She may not "get it." Don't push her away from stuff or towards other stuff where it's clear she's not really up for it. You could get the rebound effect with the allure of taboo pink and glitter being too much to resist!
Realise you won't get it right all the time, but don't give up thinking it's too hard to bother. You can never know when one thing you say or do will actually be the thing that sticks with her, that helps her to engage more effectively with the sexism all around her, helps her to survive and thrive at a later date.
Accept that you'll get criticised from all quarters. You're making too much of a song and dance and should just accept that naturally boys and girls are different. You're depriving your daughter of things she wants and she'll get bullied for being different. You're not doing enough to eschew your own male privilege. Don't expect any pats on the back. Don't do it for that.
Hey, good luck.