Will this hurt my credit?

So I’m looking at taking out a loan but my credit is pretty bad. My husband has excellent credit as is going to cosign. I’ve been doing my research and found that it’s good to have a mixture of different types of accounts. I also want to open a Credit card and was thinking about using some of the funds from the loan for the security deposit but I’m a little concerned that it might hurt my credit to open 2 accounts so close together. Is it true? Will it hurt my credit?