My few cents.
From what I know, try starting small with the games by experimenting from codes to how the game behaves and what type of game segment you're aiming for. You can have 2d RPGs, 2d action shooters and some storyboard games like Sam & Max, who knows maybe later you may be one of the guys who made some big azz titles.

Development of the game needs alot of analysis and requires you to do alot more homework than before. From financial point of view to time, resource and skills which is obvious.

For coding, using the right prog language is important in my opinion. Bugs usually cause by human error though.

For Marketing, depending on what audience are you aiming at. Hardcore or casual or super casuals ? Having lots of ads for the game doesn't prove much success when the market is full of the type game you have to offer.

It doesn't necessary to be like big budget titles.

Personally I'm not very good at any prog languages (learned C++, Java), never good but decent also I'm more of an art guy.

However this doesn't stop me from making new maps with home-brew functions on it for games since these days you can easily find editors or getting free SDKs to make your own stuffs with a little of coding knowledge.

There's alot of people who is money minded and they don't care whether you do it for passion or the love of doing it.
They just want money from the stuffs you do else they'll paste a "wasted time" over your back just because it's their opinion, which is sad.
But then again, doing programming for getting food on the tables is another matter, money really matters here though.