Q: Don't put all your eggs in one basket
A: At the same time, don't spread yourself too thinly. Resist jumping into something just because it sounds good. Above all don't jump into everything that looks good or you may end up failing at all of them, because you lose focus quickly. Start with the one idea or area you think you are best at, research it thoroughly and focus on it sufficiently long to start seeing results. This experience will help you avoid pitfalls for your second venture.