The price could come down and retest the level or it could continue going up up and away.
That is when you decide your entry. If the retest (old resistance) is sucessful, then seize your entry (the third candle from breaking out). If it fails, find other chances from other coins.
There is a misconception that entry point is when the resistance is broken. If you buy at this, your chance is 50/50 cause as said above, the retest can be failed after that. When it fails, people have the tendencies to sell out of fear. You have to cut losses then.
P.S: Words of advice for a new trader: only trade when market is in up trend.