If you don’t have a sponsor, you can speak to your pastor or the RCIA director, and they will help you find someone. I came to the Church on my own, and the priest who leads our RCIA classes made arrangements with one of the parishioners who helps run the program to have him act as my sponsor. If you are being baptised, your sponsor is also your godparent.
Given the lateness of your post, I’m guessing you are not joining the church at the Easter Vigil? Ordinarily when one is being baptised, they take part in the Rite of Acceptance, the Rite of Election, the Presentations of the Creed and the Our Father, and the Scrutinies. The first two have passed for most churches, and in my church we’ve even completed the Presentation of the Creed already. I know there is some flexibility in terms of the rites, but it seems a stretch to try to fit all of them in before Easter. I’d also encourage you to take time to really grow in this journey and not rush forward with the process - RCIA can be a very enlightening experience if you let it.