Tomatoes are good to learn with. I always advise people to get used to them first. Better than wasting pot seeds. Soil mixes differ too. Some hold water, some dry out really fast. Once you get used to tomatoes in the mix you're using now, you can experiment with different mediums, but what ever you use, nothings better than shoving your finger in it to feel for moisture. I tried out several meters for a friend trying to help him 'get it right', but they all sucked & I threw them out. The finger never lies! LOL! Just don't plant all your tomatoes at once. Divide them up for several runs, & of course for next spring, nothing beats having your own tomatoes for that 4th of July cook out!
----Seedlings are touchier than mature plants. Once you make it through this, things get easier. Learning with the tomato seedlings will make it easier for you with your next batch. Now go have some FUN!
~~~PEACE!~~~