If you not use English speech, try to find your local language. or just use popular instance (i.e mstdn.social mastodon.social) select with:
- instance server rules that you agreed
- server newer down before
TL;DR I suggest to use official instance cuz it has many people in local instance
for client, I suggest moshidon (forked from megalodon) it foss and available in f-droid