I just play ROTMG after work for maybe 30 min-1 hr and I've only been playing for like a month now so I have no fame almost since I've only died when needing a char slot.

I got an uncommon humanoid pet with H/MHeal/Ele, how much money would I have to spend to get a decent pet where I can notice the healing? I got around 200 life so I can buy some of the FP items for the lower levels.

http://guidescroll.com/2014/05/rotmg-pet-heal-and-mheal-data/

Most people would agree that once your pet heals around 45-60 HP per tick is when it's noticeable and "good enough".

You'd have to spend a decent amount assuming you use Realm Gold. The below link will help you determine the total price in USD.

http://guidescroll.com/2014/05/rotmg-getting-an-overpowered-pet-guide/

Maxed rare is more then enough for anything atm. (solo shatters is like the only exception)