A. Definitely!
B. You need to determine which 864 form to use. I haven’t seen previous post/comments, so not sure which boat you’re in. It will depend on how many people you’re sponsoring, what you’re using to prove you can sponsor the immigrant (self employment, W2 employment, assets, etc), and whether you have a co-sponsor. I was able to use 864EZ because I earn enough income myself to use solely to meet guidelines for our household size and am only sponsoring one immigrant. The 864 instructions will breakdown all the details.