Hi, here I shared a kiddies T-shirt pattern with measurements file: Crest a Layout - #6 by Grace. And here, @slspencer shared her easy T-shirt pattern: Curves with same length - #17 by slspencer.
Have a look at them and see if you can figure something out from them. A T-shirt can be made from the basic bodice and sleeve pattern in all the books teaching pattern making. And to create the armhole and a sleeve to fit into that armhole is a bit complicated to just explain like this.
Here is a site that has videos that you can follow: http://www.appletreesewing.com/tshirt/
And this one gives written instructions: http://madmim.com/my-basic-fitted-t-shirt-pattern-made-to-fit-you/
And here’s one with a raglan sleeve: how to pattern draft and sew a raglan tee in any size
I hope these help you. Please don’t hesitate to ask if you have any problems further 