Invest almost completely in arena , and use the BuzzerManager program to help tell u what to build , how many and what price. Start setting your scouting points to 10000 per week and keep doing that until u reach 35 points. You'll end up having a badass arena and some solid talent to draft. Whatever you have left spend on filling your roster.
If you do this , I'm almost positive you'll have a completely flawless start.