3 ways to avoid stalemate:
1. make sure your opponent always has a pawn or piece to move
2. don't make fun by promoting to unnecessary queens but checkmate when you can.
3. Get a losing position by giving everything away. You are then unlikely to stalemate your opponent and when he does it to you, you will be over the moon! 
As a newby it's interesting what you wrote. But I understand why me ad other new players want to kick off pieces off the board as much as possible. Exspecialy when playing against a stronger player. Its easier to get the overview what is going on. While when many pieces are on the board it's easier to make a mistake by not have seen I placed my king on an attacking position not noticing the bisschop on the other side of the board.
Of course we need to watch carefully but it's taking more time for newbies to have a faster overview on the board.
just use 2 queens- move your king out of the way
3 queens is bad. 2 queens are suffice to checkmate 
don't promote your pawns into queens if you already have a queen and rook. I once saw this game where one guy had a rook and queen and instead of checkmating the guy, he promoted 4 of his pawns into queens and he accidentally stalemated.
Stalemate is it’s your move but every move is illegal and your king is safe.
If you are at a pawn and king end game and you already have a queen, sometimes it's best to promote to a rook. If you are just slaughtering your opponent and just know the ladder mate, move away any non essential piece that is attacking the squares the opponent's king may go to.
Some stalemates are forced. This could be because of where the remaining pawns are to not having enough material to checkmate.
A rule of thumb for scholastic tournaments and games between beginners:
K+Q vs K will be a draw about 50% of the time and K+2Q vs K will be a draw about 90% of the time. In the first one an always-give-check strategy hits the 50 move rule. In the second one you also have additional stalemate possibilities.
First don't just promote to showboat And second if only king is left then give continuous checks until you mate him
First don't just promote to showboat And second if only king is left then give continuous checks until you mate him
Continuous checks does avoid stalemate but can lead to 3-fold repetition or the 50-move rule.
Learn how to safely trap the opponent without checking (necessary for K+Q vs K) and also learn how to further restrict the opponent while checking (tailor made for K+2Q vs K).
Avoid stalemate is really easy just don't get 3 queens. You don't need that much material to checkmate. And you can move your other pieces(like your knight) away to make it easier.
Noted. Really going to analyse this when it accurs. It's a major mistake I made/make as a beginner: Only focussing on having more and better pieces instead of checkmate h opponents fast as possible. My statistics always shows me a lot of missed wins.