Hi, getting closer to finishing my machine so time to start thinking about ordering some end mills. I've had a good read around but a little confused.

I'll give you an example of 3 different jobs I want do

1. I want to cut MDF to make an arcade cabinet
2. I want to mill a 3d mold for vacuum forming from MDF (I think I need a ball nose cutter for this)
3. I want to mill aluminium plates and hole accurately so I can build another machine.

I think I want 1 or 2 flute end mill for aluminium but unsure what sizes would be good? Are the cheap HSS ebay bits ok to start out with until I learn how to use the machine. I'm very unsure on what bits I want for MDF.

I have ER20 collet, 2.2kw spindle.

Open to suggestions, I'm a total newbie and have no end mills.

Thanks
Desertboy