When I did it last year, I put the classes I enjoyed the most and also the ones from which I had a LOR. Good luck to you all! If I remember correctly the first batch of interviews come around mid-July and later. I didn't get my Southwestern interview invite until mid-August and it was the first one. If I remember correctly the invites came like (I applied to all the TMDSAS schools):
TCOM (mid-July) *phone
UT-Houston (mid-July) *I think by email, but am not positive
A&M (late July) *email
UT-San Antonio (Late July/First August) *Mail
UT-MB (Late July/First August) *Mail
Texas Tech (Mid August) *Email
UTSW (Mid August) *Mail
Last summer I checked my mail constantly, good luck to you all, I really enjoyed the Texas system and all the students I interviewed with were great and friendly. I made friends on interviews that I noticed will be in my class next year!