Beginner with barbell

So I’m wanting to buy a barbell and some weights for it. Ive never really used one but to give you an idea of my baseline for what would be most comparable is I’ve been doing p90x at home for quite a while with 8-25 lb dumbbells depending on the exercise. I feel like I’ve hit a sort of plateau in the sculpt I’m wanting tho n want to mix it up now. I’m not able to go to a gym cuz of my schedule n kids but would love to lol so just wanting to buy my own but trying to get an idea of what weights to start with. I’m thinking 2 different sizes just due to cost at this time is what I’ll start with.

Thanks :)