i have a little experience of raspi 2, since the compatibility, i am sure you can use it as your alternate PC.
do u have a 32/64GB micro SD card anyway (it is much more affordable nowadays)? if yes, then try to install the file given by raspberry pi (raspian, noobs, or ubuntu), after that, use your keyboard and mouse for your pi.
no dongle needed, it is built in!
that's my part of assistance.