1) I have provided only two photos while filling out online. One 2x2 Photo of the petitioner and One 2x2 Photo of the beneficiary.
2) Signing I-130A doesn't indicate that spouse is inside the U.S. You are confusing the rule that if the beneficiary is abroad, they are not required to sign I-130A but not required means it is up to you if you want to sign it or not.
3) One of the most important part to avoid unnecessary delays is to correctly indicate if the beneficiary intents to adjust status in the U.S or apply for an immigrant visa abroad at the U.S. Embassy or U.S. Consulate; (This is located on Page 8). I have seen a lot of people making mistakes and filling both or putting adjustment of status while the beneficiary is abroad, and USCIS keeps the case and doesn't send it to NVC, so keep the focus on this part.