What do you mean by avatars?
Questions
Best way to start? I like to say "good luck" and then open with the King's Pawn Opening: King's head Opening.
Best way to start a chess game is to move a piece, assuming you mean online where the pieces are already setup for you. Over the board setting the pieces up is usually the best start,
If I am outnumbered king vs multiple other pieces I usually resign.
The question is about the Opening, which I'll discuss below, but first let me warn you not to get caught up in studying openings as if they are going to win a lot of games for you. The purpose of the opening is to get you to a playable Middlegame. The Middlegame is usually won mostly by Tactics and also by Strategy. Tactics, by far, should be what you study the most. Strategic and Endgame principles are important, but for non-masters, the key to success is recognizing and executing tactics.
That said, let's look at what you need to know about Openings. Note that there are lessons and videos all over the Internet that cover these things and the lessons and videos at chess.com are very good.
First, you need to know Opening Principles. The best book I know is an old one by Larry Evans and 6 other Grandmasters called How to Open a Chess Game. It begins discussing space, force, and time and gets into greater developments.
Most of the games you play will be leave the "book moves" somewhere in the first 10 moves. So, much better than memorizing large numbers of opening variations is learning The Ideas Behind the Openings, which is an old but excellent book by GM Reuben Fine. That way you can usually find your way through the opening based on principles.
A more modern book is James Eade's Chess Openings for Dummies (c.2010). It covers both the opening principles and some openings in each style of game.
Number1
What do you do if you are outnumbered king to multiple other pieces?
How do you get avatars?