I want to make a 1st order low pass and high pass for a 2 way system, Im going to make it for some simple learning and fun

It involves a 10" mid bass and a high power horn tweeter

I know all the crossover involves is a single capacitor and single inductor of a certain value for a 1st order (unless you series some smaller values to get your target value)

When I find some or read inductor specs they have the reading of resistance of like between 0.1 - 2 ohms, to me that is a lot, which will make my final load over 8 ohms to my amp giving me less power

My questions: How do I, you or manufacturers keep the total load to your specific level of 8 or 4 or whatever you use, because when I measure my current speakers they have a load of 8.0 ohms and they are 2.5 way

When making a passive crossover accurately do you break in the woofer first then measure what the impedance is at the frequency you want to cross then put that impedance value in a crossover calculator?

Im only just starting to learn about frequency impedance

Thanks Cya