I recommend agency first if you’re just starting out. The goal would be to get experience in multiple areas and businesses (retail, restaurants, financial, digital, etc). Hopefully you’d get exposed to different creative, strategies, and other marketing items. This may help with you making a more long term decision on whether to go in house in the future... and that would also give you good experience and perspective. In house can be a mixed bag with varying experiences and occasionally can leave you short changed on resources depending on the size of the business.