Screening tenants for my first rental

[Jeffrey Lecroy]

I have recently listed my first rental . I set minimum rental requirements and I have had a lot of interest but requiring a deposit along with first and last month's rent has turned most away as that does not seem to be the norm in my area although I have a application from a young couple he is 24 has a 635 credit score he is a Marine and he broke his back and draws disability from the military.  His wife is 20 has a 725 credit score but has nothing on her credit. She doesn't work and is in school they have 2 young children and I guess I'm just a little unsure they meet all the requirements 3x rent is 30000 income. His check is for 42000 . They have really no prior landlords due to they lived on base for 4 years and with parents before. Any advice appreciated.