new driver,4person family,help to choose RV,thx

I browsed the craigslist,some dealer,rvtrader, 85-90 class c is about 3k-5k usd,90-99year is 5k-12k.low miles, private seller;Cruise America is 17K usd,170K mile,2008;El Monte RV is 250K usd,low miles,2008.

which one is better? I have no mechanical skills,those 2 years,just want travel in CA,when I have more experience,I will sell this first Class C?so I want to save money for my first RV,just want to have experience first.

If I rent a class C for some time,the money can buy a old class C?

thanks