@OP
Kanji is ideogram, and each part of one kanji (or the whole kanji) has meaning.
If you ignore it and make kanji with irrelevant pictures, it does not make sense and does not help people to learn kanji.
What FinancialWar pointed out is true - one should learn 雨 first, then go to the kanji which has 雨 as a part of it (called 'radical') as the kanji using 雨 is basically related to rain, sky, weather.
雪 (snow), 雲 (cloud), 霙 (sleet), 霜 (frost), 霞 (haze), 霧 (mist), etc.
Here's a very good picture showing why rain is 雨, or how the kanji 雨 is in such a shape.
ぬりえで漢字を学ぶ幼児教育NET[雨][傘]
雨
(On the latter you need to click on the picture several times to see the changes.)
For 火 (fire), you used fire at the bottom and with match or tobbacco? above it, but actually the origin of the kanji for fire is wood sticks at the bottom and fire is burning on them.
火
(Click on the picture then you can see how it becomes kanji 火)
As Mike mentioned, there are many such materials showing picture/pictogram/kanji out there.
Here are some examples.
Quick Kanji - Language - Kids Web Japan - Web Japan
Teachers Resources
漢字の成り立ち1年生
If making pictures of kana/kanji helps you to memorise the Japanese letteres, you do not have to give it up, but you should also know that it is not a good material to teach others.