Need help with a partnership agreement

I am entering a partnership on a small business I am starting with a friend. We will both continue to work our day jobs but we will put in equal effort. The only catch is I am providing $50k in startup funds and he is providing $5k. We will be putting all profits back into the business for at least a year. I would think that this split in initial investment would affect the ownership percentages but I have no clue on how much it would affect it. Is there anything out there as far as tools or advice to manage this? Thanks