In Texas, it's fairly easy to get into substitute teaching. The public schools normally require a bachelors degree. I've seen some private and charter schools that require certification on top of a bachelors. The private schools tend to pay less. Your experience will depend on the school and the district. There are schools in my city where I would never substitute. You're on call and can decline when you want. I don't know how much substitutes struggle with getting called up.
Graduate of Not VUL or ENEB
MS, MSS and Graduate Cert
AAS, AS, BA, and BS
CLEP
Intro Psych 70, US His I 64, Intro Soc 63, Intro Edu Psych 70, A&I Lit 64, Bio 68, Prin Man 69, Prin Mar 68
DSST
Life Dev Psych 62, Fund Coun 68, Intro Comp 469, Intro Astr 56, Env & Hum 70, HTYH 456, MIS 451, Prin Sup 453, HRM 62, Bus Eth 458
ALEKS
Int Alg, Coll Alg
TEEX
4 credits
TECEP
Fed Inc Tax, Sci of Nutr, Micro, Strat Man, Med Term, Pub Relations
CSU
Sys Analysis & Design, Programming, Cyber
SL
Intro to Comm, Microbio, Acc I
Uexcel
A&P
Davar
Macro, Intro to Fin, Man Acc
MS, MSS and Graduate Cert
AAS, AS, BA, and BS
CLEP
Intro Psych 70, US His I 64, Intro Soc 63, Intro Edu Psych 70, A&I Lit 64, Bio 68, Prin Man 69, Prin Mar 68
DSST
Life Dev Psych 62, Fund Coun 68, Intro Comp 469, Intro Astr 56, Env & Hum 70, HTYH 456, MIS 451, Prin Sup 453, HRM 62, Bus Eth 458
ALEKS
Int Alg, Coll Alg
TEEX
4 credits
TECEP
Fed Inc Tax, Sci of Nutr, Micro, Strat Man, Med Term, Pub Relations
CSU
Sys Analysis & Design, Programming, Cyber
SL
Intro to Comm, Microbio, Acc I
Uexcel
A&P
Davar
Macro, Intro to Fin, Man Acc