The main thing is to thing and understand the program and its limits .Anything standing on 2 legs is possible in vroid. First you want to go completely threw the program and see what's there . You don't want to just start something and only haft way know all its feature. Do tests on what this dose or how this works. Also I subject buy a laptop fan (like this) I use to have this problem where vroid would run slow but I figured out that it was because my computer was over heating and it had no internal fan. So check the bottom of you laptop to see how hot its getting when running vroid.(overheating is really bad for the hard drive and can cause hard drive failure I had the learn that the hard way as well as most people who get hard drive failure but I got lucky and was able to save everything but other people weren't as lucky so back up you data) I also suggest using another program to draw your textures in, hear are some free ones gimp,(and yes ms paint ),ibis paint(there is a pc version of ibis) ,kleki, etc. If you having trouble with textures you can find some in the vroid booth.
but is this what your looking for