Advice for buying/developing property?

Hello. I'm 18 and entering the real world. In >3 weeks I ship off to Army basic combat training, then 6 months of advance training. When I get back I should have around $15,000 saved up. As I am in the National Guard, I will be a reservist. I have been thinking a lot about where I will live and have done a lot of research into buying my own plot of land and developing it as opposed to living in an apartment and paying rent (which doesn't appeal to me at all).

I have been looking at rural properties anywhere from 5-20 acres

I have been looking at trailers to live in while I develop my property

I have taken into account:

Water -- I want a well

Electricity -- I want solar panels with a backup generator

Property taxes

What else should I look for?

What are the pros and cons of developing your a rural plot of land as opposed to renting an already developed house.

Any other advice?

I live in Washington State, and have predominantly looked at heavily wooded land.

Thanks