Europe to me

I have an opportunity for 4 weeks off from work during Nov and believe it or not I have NEVER been to Europe but the downside is I will be travelling ALONE, I am a 25 year old guy,and I have always dreamed of going to Europe, I have made all the necessary preparations at my job now I only need some guidance! How does ome even go about planning something like this? This is something I should have done YEARS ago but life got in the way and now that I am still relatively young and "nimble" I would like to take advantage of this while I can.