Are far as cost on 1mm endmills and any wood based cutting, I would strongly suggest Sorotec, www.sorotec.de as a source that is not extremely expensive and let them know if you are VAT registered. The smaller the diameter the less you can cut in one pass and speed is still and issue. With a 2mm single flue I am cutting at a max of 400mm/min with a cutting area of 1.25mm depth and .75 mm step over.

If you are willing to invest a bit for some tools to help you over the learning curve, I would strongly suggest G-Wizard as it has helped me get a much better grip and understanding of feeds and speeds.

I, in no way benefit from the mention of these companies and am only a very satisfied client of both.

Michael