I agree with the chorus: shut up and write!! Momentum is everything, and so much can be cleaned up later.
Draft 2 is when you can really into this stuff.
Although, in the interest of expanding the discussion a little, I'll add one thing. Cutting on revision is unavoidable, but if you are massively overshooting your expected word count, the job of cutting might kill your story (e.g., if you have to cut 50%, your story would be left in pieces!).
I still wouldn't recommend you worry about it too much at this stage, but if you feel your chapters are meandering, you could take a little preemptive action and make sure to have a good idea of the chapter arc in advance. This way you know you are spending these words on good movement and not just filler.
A lot of this will also depend on your genre. Personally I enjoy writing (and reading) epic fantasy style, and chapters are commonly 3,500-5,500 (and sometimes even 10K). Hell, the prologue to Way of Kings was 6,100 words. If this is your playground I really wouldn't spare even a passing thought to chapter length right now. Other genres, however, will aim for much shorter... often 1,500-2,500... so reader expectations will be a factor if you are looking to publish. If you know you need to get to 2,500 words, then writing 10K will obviously need to get broken up. Maybe in that case, you should think a bit about it on the first pass. But just a bit.
Draft 2 is when you can really into this stuff.
Although, in the interest of expanding the discussion a little, I'll add one thing. Cutting on revision is unavoidable, but if you are massively overshooting your expected word count, the job of cutting might kill your story (e.g., if you have to cut 50%, your story would be left in pieces!).
I still wouldn't recommend you worry about it too much at this stage, but if you feel your chapters are meandering, you could take a little preemptive action and make sure to have a good idea of the chapter arc in advance. This way you know you are spending these words on good movement and not just filler.
A lot of this will also depend on your genre. Personally I enjoy writing (and reading) epic fantasy style, and chapters are commonly 3,500-5,500 (and sometimes even 10K). Hell, the prologue to Way of Kings was 6,100 words. If this is your playground I really wouldn't spare even a passing thought to chapter length right now. Other genres, however, will aim for much shorter... often 1,500-2,500... so reader expectations will be a factor if you are looking to publish. If you know you need to get to 2,500 words, then writing 10K will obviously need to get broken up. Maybe in that case, you should think a bit about it on the first pass. But just a bit.