Your husband is resident for tax purpose, you can file jointly and do efile.

You will eligible for tax rebate if meet the income requirement and both of you have SSN. 

file 1040 for your federal tax return.

it seems that tax rebate will be out in june.

一般来说,R的好处多，比如deduction，还可以享受education credit等等。

there is no uniform answer to this. It all depends on your own situations. you might want to read more posts/ regulations to determine which tax status is better.

也要报了，来学习一下