Welcome to BYC!
Hang in there, the first year is filled with steep learning curves.
Like getting a sip of water out of a fire hose
I use both, but mostly my DIY
https://www.backyardchickens.com/articles/pseudo-brooder-heater-plate.67729/.
At 12x24 it does have a population capacity of about 12-15 chicks.
That's the biggest con for heat plates of any kind.
I've used it both inside and out in the coop.
It has adjustable legs and can be tipped up and back down easily to see underneath,
both extremely important IMO.
When using a lamp the most important aspect, after
secure mounting, is a dimmer so that mounting doesn't have to be adjusted to adjust heat output. I use a red 60-100W reptile bulb.
Here's my notes on chick heat, hope something in there might help:
They need to be pretty warm(~85-90F on the brooder floor right under the lamp and 10-20 degrees cooler at the other end of brooder) for the first day or two, especially if they have been shipped, until they get to eating, drinking and moving around well. But after that it's best to keep them as cool as possible for optimal feather growth and quicker acclimation to outside temps. A lot of chick illnesses are attributed to too warm of a brooder. I do think it's a good idea to use a thermometer on the floor of the brooder to check the temps, especially when new at brooding, later I still use it but more out of curiosity than need.
The best indicator of heat levels is to watch their behavior:
If they are huddled/piled up right under the lamp and cheeping very loudly, they are too cold.
If they are spread out on the absolute edges of the brooder as far from the lamp as possible, panting and/or cheeping very loudly, they are too hot.
If they sleep around the edge of the lamp calmly just next to each other and spend time running all around the brooder they are juuuust right!
The lamp is best at one end of the brooder with food/water at the other cooler end of the brooder, so they can get away from the heat or be under it as needed. Wattage of 'heat' bulb depends on size of brooder and ambient temperature of room brooder is in. Regular incandescent bulbs can be used, you might not
need a 'heat bulb'. You can get red colored incandescent bulbs at a reptile supply source. A dimmer extension cord is an excellent way to adjust the output of the bulb to change the heat without changing the height of the lamp.
Or you could go with a heat plate, commercially made or DIY:
http://www.backyardchickens.com/a/pseudo-brooder-heater-plate