Possibly using a surrogate

Hi all! My husband and I are considering using a surrogate. We switch practices and we start our new practice in a few weeks. We had many mishaps with the previous place and found that they never tested my testosterone and it’s extremely low. I’ve had 6 pregnancy losses. We were thinking of using a surrogate at the same time we try with the new practice. We want a baby so badly and want to have it happen some way. Spam me all the information I should know from intended parents/surrogates. Thank you!