Welcome to reborn!
also, to answer your question, to get moneys, mainly you post. posting in certain threads (the wasteland/onyx arcade) benets you no money or posts as explained here
posting in other threads usually gets you 7 to 13 rupees i think.
also, if you are persistent in getting your trainer sprite in there, try replacing the sprite of the trainer you are using with your trainer card sprite, USING THE EXACT SAME IMAGE NAME ON THERE or else it wont work.
tbh i honestly recommend just using the normal sprites, because they look good, they work. and you can play the game with them.