If you need to buy a virtual machine for your trading online activity you have to take in consideration a few things before choosing the perfect solution for your needs.
The majority of trading online softwares (such as Metatrader, for example) requires Windows operating system. At the moment, the most popular machine for these kind of services is VPS SSD 2 (that in Metatrader case can be considered an excellent basic solution).
You will be able to access your VPS via Remote Desktop and then install your trading online software, keeping up to the provider's dedicated guides. After the installation you will be able to custom your software as you wish.