There is never a right amount that you should spend. Due to the nature of the platform, you should at least spend a minimum of $1,000/month on Google Ads. The next thing is the industry you are in. Certain industries cost more per click than other industries. Usually, it is because their average customer is more valuable. Consult a PPC professional to get an estimate on how much you should spend on Google Ads. Don’t spend what you are not comfortable with!