I recommend getting a lacrosse ball since they are quite cheap and versatile: https://www.amazon.com/Kieba-Massage-Lacrosse-Myofascial-Therapy/dp/B017V7UKW2/ref=sr_1_2?s=team-sports&ie=UTF8&qid=1486000450&sr=1-2

In addition, read up on trigger points and how to massage them. I suggest reading https://www.amazon.com/dp/B00ECLGALG/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1

https://www.youtube.com/user/physicaltherapyvideo I go to these guys a lot for physical therapy exercises

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https://www.amazon.com/s?k=foam+roller&ref=nb_sb_noss_2 These are foam rollers

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https://www.amazon.com/Kieba-Massage-Lacrosse-Myofascial-Therapy/dp/B017V7UKW2/ref=sr_1_1?keywords=lacrosse+balls&qid=1553734572&s=gateway&sr=8-1

https://www.amazon.com/Plyopic-Massage-Ball-Set-Myofascial/dp/B07G7BKL19/ref=pd_day0_hl_0_5/139-0990810-6676426?_encoding=UTF8&pd_rd_i=B07G7BKL19&pd_rd_r=528b8c20-50f4-11e9-9bc4-0dd02bfe95b8&pd_rd_w=4snCU&pd_rd_wg=ZYZE2&pf_rd_p=ad07871c-e646-4161-82c7-5ed0d4c85b07&pf_rd_r=9P206QBWGZ7RVKHKG2QV&refRID=9P206QBWGZ7RVKHKG2QV

These are for places where the foam roller is to big or can't apply enough pressure

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https://www.youtube.com/watch?v=t4A523-O5uk this is a video showing you some foam rolling exercises

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