[@UltikanaRe] As a DM myself, I would definitely recommend you start with a group of 4 at most, 3 would be just fine. As for me, I'm comfortable in any group size, I've played long term, short term and one-shots with groups ranging from 2 to 6 players. 

Also, I won't be backseat DMing or trying to invade your space or won't be a rules lawyer, but if you need resources or copies of manuals or anything (I've got an 8GB folder of stuff collected from DMs, websites, homebrews etc etc), just shoot me a PM or something.