Help me 3 Question

1.Individually Meri income yearly 2 se 2.5 lac hai. Me ITR file nahi krta hu... And meri age 25 hai
To agar muje koi 10-15 lac ki property buy krni hai to source kaha se or kese dikhaunga.

2. Aur agr Income 2 se 2.5 lac aur pichle 5 years se itr file kr rha hu .. tab muje agr 10-15 lac ki property buy krni ho to..
Sources kaha se or kese dikhaunga..

Please details me smjhana..

Aur
3. Pichle 5 saalo se itr file kr rha hu and income after rebate non taxable hai....
To agr me current year ka itr kisi reason se file nahi kru to kya hoga. Any notice aayega ?...
And 1 saal skip krke next year se fir se itr file krne par dikkat to nhi hogi.