The difference between "too much" and "not enough" is tied to demonstrating that you're interested and interesting.
"I am thinking about you" qualifies if you are in a committed, stable relationship. If you are 2 dates in, "I am thinking about you" violates protocol. And yes, there's protocol, you little simps. Your demonstrable ability to communicate your desirability is the one real task of courtship and the sooner you accept that it's a shorthand for a much larger discussion the happier you'll be.
Which is why "I am thinking about doing cool shit and would welcome your participation" qualifies early in a relationship. Importantly, this should reflect who you are at your best, not who you think she wants you to be. You must be genuine because you are effectively performing you and you must give a good performance. If you attempt to perform someone else she will feel betrayed (subconsciously) as soon as you cease to be that person.
"I think it would be fun to go to the fair, would you like to come?" is a great reason to contact someone. "I'm going hiking Saturday" works, too. Full disclosure: I haven't had to date since y'all were in grade school so I'm sure that some things have changed but to my sensibility, "netflix and chill" is something you use to cement a relationship, not develop one. The test is one of silence: are your silences comfortable or uncomfortable? If only one of you stops trying to fill the pauses with speech, you are not ready for "netflix and chill" or any other low-energy bonding pursuit.
One of the great things about kids is they allow you to pursue endeavors that you would not otherwise. Wanna go to the Lego store on a Saturday afternoon? Congrats. You have an excuse. How 'bout the Aquarium? Saddle up. Relationships are similar - there's a barrier to checking out that new cafe by yourself unless you are exceedingly comfortable with solitude. However, "I'm thinking of checking out that new cafe - wanna come?" demonstrates that you are sociable, interesting and fun to spend time with.
Note that it's important to consider you and to consider her. I had a girl bring me a stuffed gargoyle from the Disney store because she'd been to my place once and had noticed that everyone else used to buy me gargoyles (it's true). This demonstrated (A) she had paid attention but not enough to notice I hate Disney (B) she was thinking of me (C) she spends a lot of time at malls. From her perspective it was a nice, thoughtful gift and I took it as such. That relationship lasted four years. Later, I started dating a girl that had never gone hiking and was coming out of a difficult marriage that drained all her resources. I bought her a $200 pair of hiking boots. This demonstrated (A) that I wanted her to share my passions without any impediment (B) that I was very much not her soon-to-be-ex-husband (C) that I was willing to spend extravagantly on her. It was a risk - that's much too big a present for early on, particularly if $200 is dear to you - but it was a successful gambit. We're going on 15 years.
"Too much" is "I'm here, reminding you that I'm here." "Too much" is the "facebook poke" of relationships. "Not enough" is "I've heard I need to be distant so she doesn't freak out." IT'S NOT THAT. It's that you shouldn't say anything if you have nothing to say.
Courtship is about imagining someone else in your life and inviting them to dream with you. If you work at it from that perspective you'll gain some clarity on a process that both genders work diligently to obscure.