I had a full tummy tuck and liposuction on my arms 5 months ago.
I would suggest that you knock as many procedures out at once as you can, since going under always has risks. However, those are long procedures and you'd be under for awhile. A reputable doctor would warn you about that. (Ex: my two procedures together took 4.5 hrs).
I agree with the others. Wait to do anything to your body until you are DONE having kids. For the TT, most doctors won't do it unless you confirm that you are done.
And good luck. Do them in the colder months, if you can. You'll be swollen, bruised and genearlly out of comission for a few weeks, and the swelling can/will continue for a few months post op. If you can hide it under clothes, you'll be happier.
It was the best decision I made for myself, and I would do it again in a heart beat! :)