1 god
2 goda
3 goda
4 goda
5 let
6 ……20 let, but
21 god, 22, 23, 24, 33 …. goda
this is a rule how to use numeral + adjective try to see here: http://nekin.info/math/imya_chislitelnoye.htm
this is not easy, sorry))
i am learning russian for 2 years, the problem is here to find people to practice my speaking skills, if anyone interested in speaking in russian regularly, please send me a message. my level is mediate i think.