Where do I go for fashion ideas on a budget?

Basically, 15 years ago, I knew what was 'in' and how to dress my body. The two allowed me to look very nice, no matter what I was wearing or where I was going. Now, while I still know what does and does not work on my body, I have zero idea what is in right now. I still have a massive collection of clothing, but no idea about how to wear it. I've purchased a few pairs of tights and scarves, but I'm still struggling with looking put-together and not like I'm trying too hard...

How did I get into this situation? 10 years working as an engineer. Now that I'm in a much more visible position at work (and doing a lot less crawling behind test equipment on a daily basis), it matters that I look good. Pulling out my old fashionable clothing and wearing it in the same way I used to wear it isn't going to fly. It's just going to make me look old/dated.

Give me your ideas of where I should look for inspiration, advice and instruction. Thanks!