Re: the OP -- here's my two cents worth:
It is ten times harder to unlearn a bad habit, or correct bad technique, than it is to learn good habits and technique from the very beginning.
Bad habits give you a lifetime's worth of frustration. Good ones give you a lifetime's worth of pleasure.
Bad habits and bad technique are the devil in disguise -- they should be avoided at all costs, and eradicated from your being with extreme prejudice the very second they arrive.
The number one cause of developing bad habits, is bad equipment -- typically this means a set-up that's too fast.
Beginners with fast equipment typically start altering their swing, simply to keep the ball on the table. This is the last thing you want.
This is why I always say what matters most for beginners, is control.
Control provides consistency, and consistency is KING in this sport, regardless of what level you're playing at.
Your best serves, best attacking or defending strokes, best blocks, best footwork, your strongest side ...all these things are USELESS if the ball does not land where you need it, at least 85% of the time. (ie: by this I mean not just 'landing on the table', but landing on the right spot on the table, while moving in the right direction, with the right spin and speed).
Every other consideration or decision you make as a beginner, must therefore be made secondary to matters of control; they should all further the amount of control you have during practice.
Yes, Mark V is a great beginner rubber. It's a well-behaved all round rubber that does everything pretty well,.... so feel free to use it by all means -- assuming that is, that you can control it. If not, go for something else.
2.0mm is a good sponge thickness for a still-developing all -round game, as it can help you develop all your skills and rudiments over time... assuming that is, if you can control it. If you can't control a 2.0mm version of a rubber, owever, then 1.8mm or 1.5mm may be even better - assuming you can control THAT.... .Otherwise go to 1.3mm, or even 1.0mm if necessary.
H3 can create great spin and can also help you drill proper technique - if you can control it.
As H3 is a tacky rubber, it will be very sensitive to incoming spin -- which can make it hard to control the ball returning serve...
(...I'm sure you get the picture by now).
My advice is try ALL the above rubbers and thicknesses... No matter what country you play in, you can find somebody using H3, Mark V, or any other popular rubber you'd care to mention.
Ditto with blades - try anything and everything you can get your hands on.
Try starting off with really fast gear if you like -- hell, all beginners do that at some point.
But if at LEAST 85% of all your strokes / shots aren't landing where you need then you know what to do...
Ie: Change down again to something slower, or less spinny, or with more feedback, and just keep doing so until you can really, REALLY control what the ball does.
THEN you can try going faster again... so long as you can control it.